Sonic Boom Grunge Piece

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Finally finished the Sonic Boom piece I started the other day, and I'm actually quite happy with it! I was originally going to have a Robotnik/Eggman head silhouette in the back ground, but decided not to. The colours on Sonic aren't bright enough (which was intentional) to keep him the focus, so wouldn't have worked. Oh well! 

Here it is, along with the concept sketch below,and, if you'd like, I also did a Knuckles piece, which you can see by clicking here.

Click to enlarge
Click to enlarge