Testing colors for a low-res version before I comit to high-res for the final product.
If you're going with a dark backdrop, you may want to brighten up the witch's robe color(s). Right now she's getting lost among the backdrop, whereas it looks like you want her to be the focal point of your picture.
This looks amazing, These your original characters? Still definitely worth going to high res ^ u^
Looks pretty awesome to me!