What I like about this image is it's potential. The central female body is definitely an eye catcher and that's good for the comic cover. Somehow she looks like a well carved sculpture, very dynamic and twisted, you can even feel the tension in her muscles. But in the same time she has wonderful femine lines that makes her really attractive. I think she alone would make a great cover.

Since it's a collaborative work the part of the credit goes to the line artist, who create a structure, a basement for the building. The colorist is covering that structure by making walls. If everything is done right, we'll see a beautiful building. The same principles works in illustration.

If I were work on this I would separate the girl from the rest by knocking down the values of her companions. Right now they just stick to her. I would also play with lights and darks to add some depth to all 3 bodies. The background is looking great and that fire arrows effect is truly cinematic and stunning. However it's not necessary to paint every detail on background, sometimes some random shapes or smoke would do the job.

Anyway this is a very nice piece and I'm looking forward to see more works from you guys!