I think that theres too much black in the jacket, its really dense and weighs the bottom of the image down.
Also i think other colours might pick it up a bit, as apart from black and white theres only one, red, (yes i know hes the devil.....) and its used quite a lot and close together.
Id lighten his coat to a charcoal grey and keep the black for the shadows on it, give him a slick black 'do and go for brown shading in the banners.
I quite like the eyes, gives him a psychotic Abraham Lincon look!
Hope my inexperienced opinion helps!!
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