What things do you need to consider? Scale, lighting, shadows, colour and interaction with the background. For example, on the first shot, it looks like there was 2'-3' between her back and the front hand; the bench isn't that wide and so immediately the illusion is under threat. If the model shot was taken sitting on a similar bench, the result would probably be easier to blend in.
Wulf
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Wulf Forrester-Barker << Sites: blog / flickr >>
Gear: Nikon D40, Nikon AFS 18-55mm f/3.5 - 5.6G, Nikon Series E 50mm f/1.8, Nikon AF 70-300mm f/4-5.6G, Vivitar 90mm f/2.5 macro, Raynox DCR-250, Lensbaby 2.0k, SB600
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