So, you don't have any partition or wall between the bed and that row of seating? Is it your entertainment room + personal bedroom?
Focus wall or feature can be any wall in the room which meets any of the following criteria:
1) the wall that you see/face while entering the room
2) the wall that you decorate with your trophies, pictures, etc., usually around the TV...
3) any wall that has something to attract visitors' eyes... it could be your huge TV set or a bookshelf.
I don't remember if these rules are set by me or I just improvised the existing ones for my own use
Usually, people paint this feature wall in dark color; so that it gets "highlighted". Ideally, you shouldn't have a door or window on this wall as that would destroy the completeness of the wall (it'll not be a perfect rectangle). You can clearly see which one is the focus wall in your drawing, and you can paint it dark. If your room has more minimalistic design elements then you can paint all four walls in dark shade; if not then it would make your room look smaller or overpowering the stuff it contains. Basically, dark walls will take away the focus from your projector/LED TV
In a bedroom, two opposing walls can be painted in dark shades. Again, these walls should be complete rectangles without any cutouts. If you don't have any complete wall in the bedroom, use same shade on all the walls. Rule of facing wall upon entrance etc doesn't apply to a personal bedroom it's not meant for visitors
