I think the airbrushing came out well. Especially in the top photo you got a really good relief effect. You can see the transition form low ground around the stream on the left, a series of brown draws leading to some high ground, and then descending ground towards the stream on the right hand side.
The rings of trees are very Wegelian!
Designer and owner of Forward March Studios: The World's first comprehensive range of 3D printed historic miniatures.