No no no! We mustn't fall into that trap. Your prints are what they are. Then never change. They are NOT yellow.
Your screen is too cold.
Is that how you've been approaching the troubleshooting?
Now compare your layer mask to my layer mask, and see if you can notice the itty bitty teensy tiny difference.
By "itty bitty teensy tiny" I mean HUGE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Don't worry about that layer yet! Just get the Levels layer sorted out, so that the wall touching the tip of his hair is the same colour as the wall touching the rest of the hair. That's all that matters.