That works nicely... ties in to the line between the taillights and backup lights/turn signals. Although I'd still go with a simple flat back panel if it was me. I also would have stuck with either body color or black mirrors, but not a split. Actually, since the mirrors sprout out of a black area I'd probably have gone with black.
But, hey, that's just my opinion, and it's your design and your model. It's a spectacular success in my book, the rest is just minor nitpicking. That rear 3/4 view is a knockout!