Another comparison. I do still like the expression on the old one's face and found it kind of hard to get something like it going on in the new one. I like the new Igor better though. Again, 2004 is Photoshop, 2009 is Illustrator.
I definitely like the brain-creature you've got going on in the new one too, and her pose seems more...I dunno, I think the contrast with the angle of her head and back work better than they did back in 2004.
Have to say, though, there's something I really like about the old image's safety goggles.
I love the update. I just catagorize it as the evolution of your talents. If everyone looked at stuff they did 5 years ago, I'm sure that stuff would look strange to them today. I still have my work from high school and wonder why I thought it looked awesome at the time and find where the flaws are I would improve on today.