So, I got around to doing something I've been meaning to do for a while: figuring out how to use Texmod, and use it to extract Jack's skin file to get a good look at her tattoos. Lots of interesting stuff you can't really see that well in the game. I'd upload them to my Photobucket, but they might be considered copyright, so I'll play it safe. If you want to do it too, just find Texmod online, and use
this video tutorial to figure out how to extract the textures.
Some of my observations: First off... there was a guy a few pages back who posted about Jack's scars, including a big one running down her back. I remember thinking, "Is this guy crazy? I never saw any scars." Well, now that I can look at the texture up close, and I see what he was talking about. She' has a lot of scars, including a big one running down her front, and one on the side of her head as well; some of her tattoos are sort of drawn around them, so she probably had them before she started getting inked. I imagine a lot of them are from Cerberus's experimentations, which makes what happened there even more chilling; they must have basically carved up her entire body. Interestingly enough, some of the tattoos are broken up by scars, so it looks like she has a mix of pre and post facility scars.
Also, I may have to revise my thing about not wanting Jack to grow hair. Because getting a good, close-up look of her "past selves" on her arm, she has a history of unconventional hairstyles. A few mohawks, cornrows, dreadlocks... I've always had a thing for unique haircuts, and I wouldn't mind seeing Jack sporting any of those do's in the future.
There's a lot of interesting things in there. A lot of numbers, a set of teardrops on her back (probably keeping count of her kills, before she lost count

), all of it makes me hope even more she's back for 3, just to get a few of them explained.