The render is to small and the sig is to big so it makes up for a big empty space in the middle and like nash said, it's boring. You use only one colour so use more than one colour. Sigs most of the time look alot better with more than one colour. The pixel strech doesn't count as colour since there is such a lack of it compared to the brushes. Also, the brushing seems repedative.

Good concept, bad sig :P Just not put together that well