I worked on the UE4 GDC Demo titled "Infiltrator" this year. Here is some of the work I did on that demo. It was an awesome team working tightly together. Jay Hawkins had the concept nailed and I started from his base model that he provided for the character.  I did some renders with skin/face for pre-vis fun.  

IMAGES HERE

Here is some of the work I did for Gears of War : Judgement. Lots of collaboration as well as inventing and concepting.  Young Doms knife was a lot of fun to come up with and create.
LINK TO ART HERE