I did this drawing while I was on a trip and didn't have all of my art supplies with me. I had paper, and had brought a handful of my markers, but I hadn't brought colored pencils. So I grabbed my daughter's crayons! It wasn't very planned outbut it was a lot of fun anyway. When I got home, I threw in a few more details with pencil.
Later, I decided to fix a tree that was driving me nuts,by redrawing it on another paper and gluing it on. Now it's a collage too.