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I don`t use sites online for editing my pictures, I use adobe lightroom. However, every once in a while I browse online to see what different photo editing sites have to offer. I found picmonkey, and LOVED there cloning tool. I have had lightroom for a year and as far as I know, there is no duplicating tool for whole bodies. However, picmonkey (even though I can`t duplicate a body, I can do cool duplication effects, such as the one I did above of my friend Kelly). Try it out, tell me if you like it!
Hope this helps someone :)