i would say to get a better bg, this one is too busy and doesnt go with the sig, pic placement and text is ok, but the pic quality is not, try adding effects to it. overall its ok just keep working at it
make the pic bigger, give it a visible border, put the pic under the border. get rid of the lightning. change the width of the sigto something like 350-370px. change the font so it fits the new width.
The lightning backround looks bad. Try making the backround Bobcat colors. Maybe use brushes for the backround in this sig. Add an effect on a player, maybe overlay? Like Fabolous make the picture bigger and a visible border also.