Start the underpainting
I choose the background layer and fill it entirely with a rather neutral forest green, which will serve as an underpainting. On top of that, I pick a Soft brush, increase its size and start blocking in different tones of brown, green and blue. I like to keep a traditional approach for my digital art, so I try to always go from big to small, so that the finest details are saved for last. Once I’ve blocked in the main colours, I change brush to a Chalky one and start to flesh out the environment, sculpting out the general shapes of the backdrop. It’s still too early to start detailing.