Free Tilly

Last night I watched Blackfish, a documentary about the orcas kept in captivity at marine parks like SeaWorld. It's a devastating story that doesn't get very much media attention, and it totally broke my heart. If you're interested, you can check out the movie at http://blackfishmovie.com, read more about the "Free Tilly" movement at http://freetilly.net, and sign the petition to release Tilly to a more suitable habitat at http://chn.ge/16rcosw.

I've been wanting to practice more detailed illustrations for a while now and thought this piece was a perfect opportunity. Any suggestions for improvement on the whale?