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First of all comes the fact that I grew up with sonic. But let's put aways that and give you a constructive critique. But actually I don't have to say that much bad things about this picture. The coloring and shadows are amazing, the picture itself has a beautiful impact and sonic's impression of surprise and fear at the same time is incredible! I'm not quite sure though if it's a "rushed" one or if it's just your style, but the contours are a bit messy, which doesn't even look that bad. It even gives it a bit of a natural touch. But I really don't think there's anything else to say, other than that this picture defines the word "Awesome". I'd LOVE to see more like this, especially because I'm a sonic fan.
PS: The Barcode with your DA-Name and the year also gives it a bit of humor. I really like that.