I'm working on this project, in which I'm trying to re-create a photo in Blender.
I used FSpy to capture vanishing points to create the scene, but I stumbled upon a problem. The marks and scratches in the wall are really hard to re-create for me. I tried to look up some tutorials, and did it procedurally, but it didn't look accurate.
Whenever I tried to sculpt, the wall would for some reason go darker, which really ruins the emersion.
Please help! I would love to know how to get around this and create these details.
Image I am referring to:
Render I have currently:
Example of wall getting darker once sculpted:


