nice start, but your flowers are too obviously "square tile of flowers". Also, if you want to give the illusion of perspective, make sure you have that perspective effect everywhere, not just on large objects. A little shadow under the flower, or a few leaves that make it "pop out" will help making the whole thing fit, Otherwise, it will just give the feeling that your put a flowery wallpaper on the ground and voilą.
Since your characters are translucent blobs, you may want dark objects (like the red flower, the tree, etc.) to show through as well.
Also note that the red flower near the purple blob should remain "in front of" that blob, imho.