I did a quick scan, and slapped down some color in Photo shop. Boosted the black too. Good for color tests, possibly too simple for final color. 

Too ordinary? Probably. Maybe that’s ok though. 

The texture of the green stuff is wrong but ok just for messing with colors. Not sure how to make the right grassy shapes in Pshop nor even if that’s the right approach. Some swooshy blocky shape maybe instead. Hmmmm.