Evolving Skills?

It's February 12, and you know what that means? That's right! Once again it's Darwin Day! For the last two years, I've drawn the same picture of Charles Darwin, hoping to see how (or if) my style or technique has improved or changed. Here's a link to the 2013 picture, and here's the one from last year. I don't think today's version is much better, but at least it took me far less time to draw!