I use Photoshop CS2 and inspiration, which I get from other artists, music and even movies. I'm not into whole photo manipulation (just yet). I'd rather keep the image as natural as possible (no "fake"/plastic looking skin), although, I often tend to stylize as well. The ideas come to me as I look at the picture or as I'm working on it. So, I usually never know what the final result will look like. Just let the creativity flow.
I'm not a professional. I do realize there's a lot more to learn, and I hope that MM (among other web sites) will help me improve my skills.