It's all Photoshop, not photos. The trees were created with photoshop leaf brushes (thanks!, Burt Monroy!) The pines are made with a little blades of grass brush, and the maples, are made with the maple brush. Lots of airbrush and dodge and burn. LOTS of dodge and burn!!
I am working on learning old-school animation, hand-drawn, scanned into Flipbook, then exported to Photoshop, then After Effects. What a neat thing to see a drawing come to life and move! I will keep you posted!