Interior Perspective with Value

For my interior perspective, I was to draw a bedroom and then shade it.  So I drew my old bedroom, the shading is a little off because there was light from the door behind my (which is on a diagonal wall behind where I was sitting) and there was light from the window on the left of the drawing.

I think the part that I had the hardest time with was the ceiling trying to find an appropriate value that made sense and the bed since the comforter distorted the shape of the mattress.