That is a very obnoxious pink color, and that yellow doesn't help the matter. With the clouds still being the default Sonic 1 clouds, the simplicity of the trees and ground badly sticks out. I also can't tell what's going on with the water, if it's running off the background, or running parallel to it, with the mainland being an island or another plot of land. Foreground still looks fine, if unfinished. Really hope those checkerboard leftovers are removed, and the grass is made to cover parts of the polka-dot pattern.