it's just a cube... i Don't think this is good enough for putting it in the gallery. I've seen your two other works and they are far more complex than this one. Also, i would erase the pallete and the word "remake" from the piece, and erase the preview image too.
Why don't you try something more challenging? Maybe doing a background, making it in real perspective, puting some lights and shadows, making it animated.. I don't know, there's so much you can do with this piece to make it interesting. Even doing it with all the colors mixed would be better.
Try posting it at the forums and ask for critics, you will improve this piece , trust me.
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After your message I saw that it really is very simple to be placed in the gallery =]