Mit's Sprites and Such

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These are cute, but that mario's colours could use more contrast. I didn't even notice there were two skin tones until I zoomed in and the third red isn't really necessary (the reds could have stronger contrast, too). Oh and the blues, there's two of them too, but again i didn't notice that at all until I zoomed.
I don't think you need that extra shade for the block's corners, either, but could just reuse the main colour.

The mischievous look of him tells me he's up to crash Bowser's birthday party.