I agree about weathering the imperial insignia, but other than that I think you've got a great ship here. I would add some "blast marks" to the sides though. You can do a splotch (for lack of a better word) of black paint and then do a smaller splotch of silver paint to make it look like the paint was blasted off.
I didn't really like the Shadow Troopers very much, but now that I see them in that pic, they look pretty badass. Great job!