I have taken 2 very similar group shots. In the better one (shot 1), someone is blinking. I have cut their eyes out Shot 2 and placed it as a layer in shot 1. the problem is that the colours are different so it stands out like a sore thumb.
Is there a way I can blend the layers so that the eys are prominent but the same colour as the background layer?
Masking it would be the quickest, and easiest, way, but it may not produce the most natural results. If you're willing to take the time (and possibly lose a few hairs):
Get the second layer, and a hue/saturation adjustment layer, into the same group. If you're using Elements, make sure the adjustment layer is the "branch" layer. If you're in CS, switch the blending mode of the little folder to normal instead of pass through, and make sure the adjustment layer is above the image one.
Then proceed to mess around with the saturation and lightness bars until you get a skin tone as close as possible to the base image.
Last of all apply a mask (the image itself in Elements, and the folder in CS). Then in the mask (it should first appear as a white box next to the image of the layer in the layers palette) use a VERY SOFT brush to paint black around the edges of the top image layer. This will make any transition between the colors of the two layers less noticeable.
My question would be - why are the colors so different if you shot them one after the other? I'd go back and process them both the same - are they RAW files? Get them to match first, then clip out the eyes and paste them in and blend.