First course - drawing out the coastlines and adding some texture to land and water. I used a portion of the South-West coast of NZ 

I then went on to practice the three mountain styles shown in this course

 

I drew in the mountains and the rivers, blending the rivers into the coastline so they appear a bit more natural.

I tried a few different styles of forests. Different variations of an oval brush at the top - mostly altering the scattering and transfer parameters.