I totally get you with tiring to funk it up but the dials, Floor and the cable all look the same color which is about 2/3 of the image. To me this is giving it a unfinished look as it almost looks...

Very nice model - Good looking render.

For me the dials, cable and mouth peace look unfinished, shaders wise.
Is there a reason they are white ???

Looking at some ref (as I never seen one...