I have never suggested cropping to 5:7 shape.
http://www.damiensymonds.net/2011/02/selling-digital-images.html
Can you show me a screenshot of the options that are available to you?
Could you do me a favour? This purple hand would be a good subject to include in my Skin Class. Would you be willing to donate this photo to me for that purpose? If so, could you send me the raw file?
http://www.damiensymonds.net/tut_noise.html
Maybe you could low-opacity clone the forearm into the wrist a little, to make the blend a bit better? I'm not sure, to be honest.
Oh, that's great news! Try to get the lighting similar if you can.
Well, it will be a fairly common matter of layers and masking. We'll discuss that once you can show me the photos.