User blog comment:OoppDecks/How do I get images of Sims 3 Sims?/@comment-4568327-20141112121918

My best bet is that they used an image editing program, like Paint.NET or PhotoShop, took a screenshot, and then removed the background and left only the Sim behind. If you have Superstar, there should be a green/blue screen wall paint and floor tile, which is pure green/blue, which should make it easier to remove, since you can just use the Magic Wand tool and delete the selection quickly.