The smudging to the right of here looks a bit sloppy, but the rest is pretty good :y:
You can do a whole bunch with your smudging like Irish said too. Do a bunch of layers and add different effects to each. Change the color balance on each one a bit, add filters, sharpen, etc.
I like what you did with the sig though, it's very simple and the colors are pleasing

The lighting and text gets a :y: from me