I've never really seen any of you other sigs but if you have a improved there are still areas in that need improvement in the sig. I feel as if its very dull but the lighting is there; however, you could make the colors a bit more crisp. try messing with the curves and levels. you should also try working on depth a bit since there is an attempt being made to blend in the background effects with the foreground. Otherwise keep it up you do understand the basics from what it looks like.