Today in 20:34 (8:34 PM) I've found a face in wall! Location: Prison in LVPD (Las Venturas Police Department)
Color of wall is - White
When you enter in PD you will go to Prison ( I think you know where it is ), when you see the prison cells go LEFT, ( or maybe right i forgot now in the moment ) and in the white Wall you will see the Face!
It is too late ( In my state ) out, and i'm going to sleep :)
I will investigate tomorrow
If you failed to find i will guide your way.
Leave a comment when you find or not: