This is looking very nice. Is the background and the floor on one simple plane or is it complex geo with camera mapping?
The character itself is too dark I guess. 20% more would be nice. But the rimlight do a very great job here to shape him.
And I would suggest you to add some dust or grain to get a more film like style. An environment fog would also produce more atmosphere.
I can’t wait to see more
Maybe a short animation test with final comp 
By the way. What programs do you use?



