I think it looks great. If you are thinking of adding some sps later, I would build one side up a bit. Light is usually more intense near the top than bottom and some sps may like that more.
I would pick up some more rock. My general rule is to leave about 5-8 inches from the waterline but you do want some height added now so you don't have to do it later. Also if you can pick up an aqua art kit or emarco cement you can give a bit more stability to it