stains on wall

why is the stained look on the walls?

Lightmap resolution is set too low. Personally I use baked lights with enlighten.

What is the minimum lightmap resolution? what do you think? for example indirect 10 and lightmap res 40 ?

I’d personally go 70 and use PLM

latest result Untitled 1 hosted at ImgBB — ImgBB

Looks better, try adding some baked points lights to further brighten the scene perhaps.

yes i will when add interior details. thanks all