IMO the angle chosen does not showcase the car properly. The Headlights are OK, the front bumper looks too much like the M5 whereas the M8 showcases the new design language from BMW. The mirrors are way too big.
If I have time, I'll have a crack at a render ;-). I've done 1st draft a couple of months ago, but it needs to be a little bit more "angular" looking, and of course updated with the latest wheels etc from the M5... I'd also change the ride height...