Layout on Phones vs Tablets on android

I have designed a layout with a imageview of 150dp x 150dp. It looks bad on tablet compared to phone. Please see the image below.

How do I make the layout look similar to phone on tablet as well. Using the same layout file, i.e without using different layout for different screen sizes.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RelativeLayout
        android:id="@+id/layout_title"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:layout_centerHorizontal="true"
        android:background="@drawable/title_with_shadow"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:textSize="16sp"
            android:text="@string/preview"
            android:textColor="@color/title_text_color"
            android:textStyle="bold" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/imgPreviewLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/layout_title"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="5dp"
        android:background="@drawable/category_item"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/imgPreview"
            android:layout_width="150dp"
            android:layout_height="150dp"
            android:layout_centerHorizontal="true"
            android:scaleType="fitXY"
            android:src="@drawable/noimage" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/tabcontrolLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/imgPreviewLayout"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="5dp"
        android:gravity="center_horizontal">

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_margin="5dp"
            android:layout_marginLeft="10dp"
            android:gravity="center_horizontal"
            android:orientation="vertical">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="5dp"
                android:text="@string/pieces"
                android:textColor="#040404"
                android:textSize="15sp"
                android:textStyle="bold" />

            <Spinner
                android:id="@+id/spinerCount"
                android:layout_width="70dp"
                android:layout_height="35dp"
                android:gravity="center" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_margin="5dp"
            android:gravity="center_horizontal"
            android:orientation="vertical">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="5dp"
                android:text="@string/rotation"
                android:textSize="15sp"
                android:textStyle="bold" />

            <ToggleButton
                android:id="@+id/btn_rotate_puzzel"
                android:layout_width="wrap_content"
                android:layout_height="35dp" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_margin="5dp"
            android:layout_marginRight="10dp"
            android:gravity="center_horizontal"
            android:orientation="vertical">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="5dp"
                android:text="@string/background"
                android:textSize="15sp"
                android:textStyle="bold" />

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/color_selection" />
        </LinearLayout>

        <ImageButton
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:layout_below="@+id/layout_Rotation"
            android:layout_centerHorizontal="true"
            android:layout_margin="5dp"
            android:adjustViewBounds="true"
            android:scaleType="fitCenter"
            android:padding="8dp"/>
    </RelativeLayout>

    <LinearLayout
        android:id="@+id/magic_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_alignParentBottom="true">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="30dp"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:background="@drawable/title_with_shadow"
            android:id="@+id/magic_btn"
            android:orientation="horizontal">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_centerVertical="true"
                android:textSize="15sp"
                android:layout_marginLeft="10dp"
                android:text="@string/cheatcode"
                android:textColor="@color/title_text_color"
                android:textStyle="bold" />
        </RelativeLayout>

        <include
            layout="@layout/panel"
            android:background="@drawable/background_with_shadow"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

    </LinearLayout>


</RelativeLayout>