I'm no plumber, but doesn't the cleanout have to be either vertical or at least slanted up on an angle?
Is the cleanout plug glued in place?
Why are there 2 electrical cables coming through the same opening as the pipe?
Is that reducer in the right place? I would think it should be above the cleanout.
I also see SM blue insulation on the wall (OK) but I don't know if styrofoam along the studs is OK.