More colour variation. I take it you're trying for a more classic look, but most classic costumes have at least two contrasting colours. Perhaps pale yellow for the boots, glove, beak and belt.
I think there's a punk mohawk style haircut that might work well.
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I think there's a punk mohawk style haircut that might work well.
Also have you tried coloring the part of the "beak" mask around the eyes black?