It's a Firefly render on the automatic "minimum quality" mode. It's what I have my default set to, to speed up rendering until I'm ready to make a final render, then I crank up the render dimensions and settings. I think the main problem is that it's a small image (rendered in preview window), and Rosity is blowing up it up to fill the screen.

I think the second skin is a red herring. For this character, for some reason, the hips don't render. I had never noticed before, because it's an area usually covered by clothing. I'm not sure why. I haven't done anything out of the ordinary. Sometimes hidden and unhidden body parts to deal with poke-through, but no CR2 editing or anything. Just some kind of file corruption?

Here's what it looks like with a plain color applied. I bumped up the render settings. (Still Firefly.)

Preview:

Render:

Settings: