Frank Cho tries to keep his anatomy tamed down to human size: look at the proportions of Red Sonja's tibia in the image below from the cover to issue #1. That's actually a truly human proportion, most comic book artists (and fashion artists) will elongate the space between a knee and ankle (something noted in the old John Buscema/ Stan Lee "Drawing Comics the Marvel Way" book from the 1970s).
On the other hand, Cho tends to give all of these muscular woman a bosomy abundance that is generic in the environs of the comic book super worlds, but sort of absurd outside of this particular male-dominated corner of fantasy art. Besides the anatomical anomaly, there is the natural physics of a snowy, freezing world in which a woman can go about in a steel bikini without contracting double-pneumonia (satirized here).
Frank Cho New Avengers cover #15
Original page Feb 2010: updated July 2011