This is Trev Madison when his demon side takes over.
I had a pretty good image of him pictured in my head since I'd already drawn the head shot of his normal self.
Notable changes are his darker fur, evil, blood red eyes and his hair is a little more spiked out and darker.
I wasn't sure about how his hair would be in this form, but this looks better than I thought it would.
The main thing is that Trev approves.

Trev Madison belongs to  thetrevmans
To read his story "Journey" visit his DA page https://www.thetrevmans.deviantart.com