Remove gradual "whiteness" of the picture

[pygmalion]

This problems bugs me so often, I decided to post a question here.

I usually correct the whiteness of the pictures by using Level / Pick white point tool.

However, so often the "whiteness" of the picture changes gradually over the picture.  Is it possible to correct "whiteness" gradually all over the picture?

Thanks for your suggestions!

https://i.imgur.com/e7Y6Q1D.jpg