Time for action — adding contours to the back side of the island
It's a small point, but the back side of the island is too smooth and flat. So next you will add a few contours to make it look more realistic:
Select Layer 2, then select Layer 1 while holding the Shift key.
Select the Island with theRMB. Press the Tab key to go into Edit Mode.
In the 3D View header, choose the Vertex Select mode.
Press A to deselect all of the vertices.
Select a vertex in the center of the cove with theRMB.
Press Shift+S and choose Cursor to Selected from the menu.
In the 3D View header, set Pivot Point to 3D Cursor.
Press Numpad 7. Press the Home key on your keyboard to see the entire island. This is not the Home key on your Numpad. If you are using a Mac, press fn+Left arrow. Then use Ctrl+MMB to zoom in.
The bottom and right sides of the island are unnaturally smooth. You need to put in some small variations to make them look right.
Press C and select some of the outer edges of the island, as shown in the following...
