Cool drawing. It has great balance and contrast, but I feel that the symmetry takes some of the excitement out of it. Play around more with asymmetry. As far as the background goes (I know it's not part of the drawing, but used to present the drawing), the flat colour takes some of the depth out of the final composition. One way you can restore this depth is by using a very slight linear or radial gradient. Also, adding a shadow below the character would be a big help. Keep at it! :D
My favourite from you. Looks awesome!
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