Those foliage brushes are great. I'm assuming you meant that you used them to fill in the background trees and bushes. They really give the area a lot of detail, they remind me of how the famous instructional painter Bob Ross used to do leaves on trees and bushes.
Great drawing. She looks screwed but, given that she's not your typical Robin Hood, I'd imagine she has a way out.
The colors on a piece like this are fairly predictable, mostly greens, yellows, grays and browns, but you still did a great job with different shades to make certain details pop more than others.
Robyn hood
