The middle just looks so dead, and totally like kills the colors in it like that ugly green under Riku's leg.
Those greens just bug me so much D:
I like Sora's side alot, like the way the lighting is and stuff, but Riku's side looks oversharpened a tad, and maybe less contrast would be better on the stock, and the brushes just seem to be really random. Idk, I don't think it would look messy though if you fixed it up, and got rid of that green. That green >:c