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Add an adjustment layer brighness/contrast to the ourang-outang and reduce the lightness full to -150

Now you can start working on highlighting the parts exposed to the light. In this case, from the back left and from the right side.

Since it is a mask make that active and with a soft brush at 50% and considering the anatomy of the animal brush away the dark part where the light should hit the animal

If the effect is not strong enough you can make the animal layer active and dodge gently the light parts

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