This is the third time posting a thread about GUI's. But this is only about the backgrounds.
It seems that my GUI's background image has an "overlay" type layer in pink:


And, according to the original images, my head/hands/whatever has light colors on it, is painted pink.
Original head:


How can I fix it?

I wasn't using any shader, I opened it and I saw it pink.
The tori is a render, and not a tori ingame.

Where do I change that?

.png file or other type?