Looks awesome! There's so much things I like about the image. First off I feel you were very true to the design, both Amy and Robotnik look very classic almost as if they were drawn by the official artist. Next the motion in this picture is crazy well done. From the smear of the hammer striking down, to the badnik head flying off with particles and ripped wiring, to robotnik's egg thing propelling gas and getting into warmer colors closer to the machine, etc.. It's just very well done all together! And the background work is great too, giving the characters enough focus while being pretty. Amazing work, keep it coming!!