Very cool artwork! The textured lineart and the hands look quite nice! I also like how you did the highlights on his shoes and quills! However, I do feel that it's a little stiff compared to the original. The line of action feels a bit like a straight line. Also, the left ear looks like it's connected to the center of his head a bit. I would also recommend adding an eyebrow on the right eye as well since the expression feels somewhat blank without it. But overall it's a very well done piece! Sonic artworks make me smile :)