This recent article posted on the Wizards site needs more thought, but also more attention. The topic it brings up is a very important one to address. Unfortunately I don't think the article does a very good job of tackling it. It's an ok first start, but it missed the point.
I appreciate that the author acknowledges his bias of being an older male who tailors his art to fit market demand. I agree with what some of what other commentors on the article said though. Looking at this in terms of "sexism" is actually missing the mark. Fantasy art is not typically guilty of being sexist, but in sexually objectifying women. Definition here for clarity.
I think Dragon Age 2 handled the depiction of their women characters very well:
You had Isabella, the cliche nearly naked, naughty fantasy pinup,