This isn't an easy-to-fix, but a casual observation. When you're trying to comp images together, *always* try and match the lighting- it'll make things a whole lot more believable.
If you look at your background plate, the light is very strongly from the right, casting cool shadows. The model is lit pretty much front on.
Now, you *COULD* manually fix this byl
1) duplicating your model layer
2) hide the top model layer (click the eye next to the layer panel)
3) on the now-visible original model layer, use the image>adjustments>photo filter, and choose a cooling filter. Then after you've cooled that down, use curves or levels to darken the layer a little so its sympathetic to the shadow-tones in the background image.
4) Make your new copy of the model layer visible again
5) Add a blank layer mask to that layer
6) click on it, and start painting with black. This painting now will paints holes in your warm/original layer, revealing the cooler darker layer behind. So, paint out the left side of the model, so she looks neutral/warm/lit on the right, and cool/dark/shadowed where you've painted out.
a) sorry if this is a bit hurried and doesnt make sense. b) sorry if it sounds patronising and you know photoshop well (Forgive me, I dont know your level of experience with it!)
c) Have a go, and feel free to show your new revision!
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