Two engineers that used to work for Picnic ( the online photo editing tool that stopped recently) made another site, PicMonkey. You should go take a look. It is very easy to use. You upload your pic, make the changes you want and download the pic. It is free and you don't need to register!
I uploaded a pic of myself, removed the wrinkles, whitened my teeth, put on some mascara and on top of that gave myself blue eyes. I looked stunning, on the pic that is ;-)