Custom portraits newbie

I got GC2 about 2 weeks ago (after 2 weeks of playing the demo), and was disappointed by the lack of human females to select as a race leader. So I made a few of my own using a program called Poser. I guess these should go in the Library, but I'm not sure what I need to do to get these in the proper filepack to upload them there. I use Paint Shop Pro for imaging, so I can easily convert these to .png's. If anyone is interested in something like this, I'll work up a few more of them and try to upload them as a proper pack.