egafd.com

To thin a face you could do it quite easily with Photoshop and the Liquefy tool. There are other programs with a similar filter I think. All you do is select forward warp on the left menu, click into your image and drag carefully. Play around with it and see what you can do (if and when you get hold of a copy!)

No probs. For the money (zero) I think it's as good as gimp, but a slightly lesser learning curve.