i love the concept with the glasses a lot. perhaps the background
can use a couple of brush strokes. you can search for nice custom
photoshop brushes at
http://www.deviantart.com. there, go to Catagories ->
Resources -> Application resources -> Photoshop brushes. in there,
you can find brush sets you can install to your photoshop. a lot
of them take away a lot of work for the background, and if you use
them correctly, they can really add to the flow of the sig.
personally i always like sigs a bit more flat in size, like the
one icealya currently has, but i really like what you did there.
^ i know this isn't a sig for me, i'm just commenting a little <3