Here is an environment I did in the lab while sitting in on a class last week. I think it has potential, so I'll probably work on it some more this week:
Some more film still 1 hour paints:
Doubt - 1 hour
Inception - 1 hour
Some mornings those are easier to do than others. I try not to directly paint over, but rather flip between layers so that I'm focusing on what looks natural rather than say, paint by numbers. In the end it's an amalgamation, but it's extremely informative and I enjoy doing them.
Here are some ~10 minute thumbs for a new character: