make sure the green backdrop is bright and evenly lit; "evenly lit" is critical to a good key. keep the model at least ten feet in front of the backdrop. make sure there are no wrinkles in the backdrop. use backlighting to separate the model from the background and, hopefully, key in a background image where the lighting sources seem to match the lighting sources on the model.
if you do all this correctly, it's still sometimes a bitch to realistically key your model and the background together, i.e., it still might not look exactly like you shot her at the location of the image you're going to put behind her.
good luck! would like to see the results.
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