I decided to have the environment be lighter while keeping Riddick darker to push his silhouette and accentuate his light eyes. I would have gone darker if the movie seemed darker but most of the trailer has him in brighter dessert-like locations. It looks like a brighter environment than say "Pitch Black" so I wanted to reflect that.
Thanks! I spend most of my time looking at other peoples amazing art for inspiration and trying to not feel bad about my own art. Inspiration is just the best thing in the world! I still feel like I'm not putting enough time into it though, but I guess all artists feel that way though.