Waterton looks suitably sepulchral as, in 1830, in what could be seen as a kind of penance, he takes to sleeping on the bare boards of his work-room after the death of his young wife soon after she gave birth to their son Edmund.
In a moonlit room, the lightest tone is going to be the sky seen through the window but I’m going to have to redraw all or part of this frame of my section of the Waterton comic because I need more emphasis on the figure of Waterton. Your eyes adapt to the varying levels of illumination as you look around a dimly lit room, so I feel justified in introducing silvery highlights to the main subject. Could I also introduce a few beams of light streaking down from the window. That might be overdoing it but it would be fun to try.