You could go to this site:
http://www.faststone.org/ and download the Screen capture program. This will let you capture what you want from your screen and save it where you want. I save in My Pictures. You can then use an image editing program to modify the image. It will probably save in a bitmap file or possibly as Jpeg.
I think that Picture It should be OK for what you want to do which I'm guessing is import a picture of your friend into an E-Bay ad.