Since this piece is so large and relies on solid shapes, I'd like to see some more refinement in trhe shapes themselves. The shape of the hair strands seems rather rough and oddly chucky in some places, and the shape of his iris is really irregular.
I'm not crazy about the AA either. It looks more blurry than smooth, and it is missing in random spots, like the insides of his lips, the shadow on his forehead and the piecde of hair next to his chin.
The shading also seems rather incomplete. There's obviously a strong light source coming from our left, let the strands of his hangs cast no shadow on his face below the eyes? The shading on his eye makes it look pillowy, not round. The red of his coat is the same on both sides, even though it seems logical that the right side should be in shadow and therefore darker.
I think this has lots of potential, and the image has a lot of impact but it seems incomplete.
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