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Green screens don’t make it easier at all when editing in Photoshop, as bleed and colourisation can still affect a subject. Once you’ve selected the subject from its layer, use the Refine Edge tool to get a perfect selection. Then, with your subject masked – and the new layer pasted below the subject – go to Hue/Saturation (Ctrl/Cmd+U) and tweak the colour if need be: set the Hue to +5 to the right, and the Saturation to -5 if there’s a slight green glow to the subject.
If not, there still may be some green reflection spilling onto the subject. Use a white, soft brush of 20% Opacity to dab at these green edges until you have a more natural-looking glow.
Finally, a warm Photo Filter adjustment can get rid of any greenish tinge to the picture, and give an overall finish to it. It’s useful to get into the habit of using filters, gradients and various other adjustments just to finish off a composition and give it a more natural look.