I love it when artists wait a few years then re-do something they put a lot of time and effort into to judge their degree of improvement. So I totally did just that!
Above is the new version. I took the same concept sketch (rather then several other concepts I had done at the time) and reworked it. I am pretty satisfied with the results! It was a good learning experience if anything, and that is really invaluable. I liked working this way a lot and would like to continue working this way in the future.
Below is the old version, from 2009. It was part of my senior project. I'm actually revisiting the whole project.