The pixelated stuff really does ruin the image. I assume you thought that the sig needed something, and you tried that out, but in my opinion it kills it. Also, the font selection is horrible. Whats up with people using that font so much lately?
By the way, its a nice sig, but all it is is two pictures on top of eachother. Nice pictures, but you didnt really do anything. I may be wrong and you may have applied stock enhancement, in which case you did a good job. Just experiment buddy, with photoshop the possibilities are endless.