In order to get any advice you are going to have to provide a diagram of the bedroom, closet and bathroom including dimensions because it is not possible to figure out anything from your pictures.

Depending on the size of your bedroom you can frame a large closet along a wall in the bedroom. I grew up in an older home with typical small closets and my parents had large closets installed in front of the original small closets because the rooms were large enough so that taking away some "depth" was feasible.

Depending on the size of your current closet you could use space efficiently and a portion of the closet used as an office. Depends on your need as I have a very large space for my "office" and had custom installation but what I use as an "office" is very small because all I need is a small desk area; a place for an all-in-one printer/copier and a VERY small file because I only keep hard copies of stuff which requires hard copies like official stuff which requires originals like birth, death and marriage certificates; passports; car registration; mortgage; estate stuff and those can fit into a small portable file - everything else is either scanned or is on the web anyway like bank statements.