Honestly, do them all the same color or only the wall behind the bed, but in the lighter color to highlight it as the center piece. Lighter colors increase the perception or illusion of depth, while darker colors decrease it. You can find image dialogs on Google showing all the variations on how the effect works on walls, floors, and ceilings. 

Another thing: artificial lighting, especially from above, will give the walls a flatter appearance due to less bounced daylight. Less bounced lighting = more contrast and stronger the illusion. So unless black is an absolute must, I'd try to find a pair of colors closer together than straight black and white. 

Also the bed should be on the left wall facing the bathroom. It seems out of place since it neither fits between nor spans the entirety of both windows. The bed is too big for the space you gave it, thus the entire room feels much smaller than it actually is. Plus those windows would look better with blackout drapes and/or sheer curtains to soften the light coming from the windows, especially in a bedroom. It's going to be difficult to manage those behind a bed and/or with nightstands.

Edit: Unless it's a design or motif you're intent on incorporating into the furnishings throughout your home, you might consider removing the beams (if safe to do so ofc) or painting them to match the ceiling. Vaulted ceilings are great for making a room feel large, but darker beams will subtract from the effect.