Could use some work, for instence the white boarders don't flow well with the green color, maybe change that (I really like the boarder though, just color isn't my favorite). Your smudging and blending is great good job on that ! Color wise I don't like the banner (just my own personal thoughts on the green). Maybe some text to fill up some room . Nice job though.
It looks pretty nice. The only thing I dislike about the sig is the border that you have on it. Otherwise, very nice work. ^_^