That's a good tip. I need to work more on backgrounds anyway. I keep trying to push my color knowledge, but damn this shit is hard ;P
Here is some more work, including a commission to paint Megan Fox with blood on her lips (don't ask why) and the final on that knife dude from earlier. Tried to push the colors a bit more and polish some areas.
This was the first sketch and it sucked so we decided on a different expression/ pose.
Pretty early WIP