I drew a window with a view of a landscape with trees. 

First, I drew a frame for the window, and then drew a horizon for the scenery outside the window. 

Set a vanishing point on the horizon and draw straight lines to define the basic shape of the window. Using these lines as a guide, draw the basic shape of the window. 

Enhance the basic shape of the window to create a sense of three-dimensionality. This is achieved by drawing straight lines toward the vanishing point. 

Once you've drawn the outside scenery, it's complete.

I simply drew a tree and colored it. 

This is a picture of a window with a view of a landscape with trees. 

Drawing a window with a view of a landscape with trees