i tried some things ! i hope i might help - pushing the overall color toward more yellow because it seems like a midday sunny outdoor scene and the pink hair and purple dress would look more brighter, and -making the color and shadow more like a solid shape and having it go darker, it might help to convey the 3d shapes better -other than that i adjusted the pose a little, (on the top left red), but further adjustment might be needed to loosen it and make it more natural | Artwod Feedback