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Honestly, it's too big to be considered a signature. I think it has way too much spacing in it. The colors need blended more. When I say blended, I mean through gradient maps with layer settings and photo filters.
Try using gradients with different colors and setting them on different blending options. I think it looks pretty nice. Nice use of pen tool (pretty sure its a pen tool). Like some people said, border looks better. If your going to keep the border, I think black would look better.
Nice job.
Btw, aren't you an old gfx artist?

