You can tell which humanoid creatures are female because they're wearing ridiculously skimpy porno outfits instead of actual armour. That applies to the mages as well (with Druid the most egregious).
Sadly this is true of the majority of the obviously female characters. Not all of them though. The non-mage elves all seem fully dressed and well protected. Selesius is also well armored. The Necropian Vampiress isn't really armored, but she's not dressed immodestly either (in my opinion).
Then of course we have the creatures that are impossible to tell gender. They all seem dressed appropriately for their role in battle and you can just as easily imagine them as female as you can male. But the creatures that are obviously female, such as the mages, angels, and faeries, look dressed for seduction rather than battle. The mages don't really bother me a great deal, because the majority of my role playing games have emphasized mages preferring clothing that promoted mobility rather than protection so as not to interfere with their magics. I have no such excuse for the other critters however.
I will admit that I think scantily clad women are purty to look at, but the art should be a bit more egalitarian. Show more fully armored women and more half-dressed muscular men.
So you're assuming that women can't be fighters? Wtf?
The real world doesn't put a lot of emphasis on the fighting prowess of females, but they most certainly are capable. Joan of Ark springs to mind. If we turn away from the real world and into the writings of fantasy, women are given an increased level of credit rather than less. Any assertion that women can not be formidable warriors is unfounded, although their limited numbers on the battlefield is historical.