Right now as it is, the colors aren't really working. It's just too bland. I'd say you either need to add a whole lot more color, or just wipe the color out all together and go with a a black & white piece. If you choose the black & white piece though, make sure the contrast is high, otherwise it will still feel bland.

Also, if you're going to go in and do some revisions, definitely make it smaller. There's way too much empty space right now and making it smaller will only help close that space.

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