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The size is a bit strange, but i spose you've done that to suit the render. I think you could have done a lot more with the render to make it suit the sig though! It just looks a bit... effectless lol. It would look good if you played around with a cutout filter or something similar I reckon.
As for the rest, I really like it. The bg is very nice on the eyes and i like the brushing at the bottom.