Consider reflections and size
Installing a bigger mirror can make your bathroom seem roomier than it is. This move could be as simple as replacing the mirror over your sink with a larger one, or going a step or two further to create an illusion of space.
As Better Homes & Gardens suggests, covering a bathroom's long wall with a mirror can make the space seem wider, and, similarly, two mirrors facing each other can mentally expand a room.
Tidy the clutter
Use recessed wall storage to contain clutter and maintain a more spacious look.
Whether you create shelves or install a medicine cabinet or floor-to-ceiling closet, recessed storage gives you more room to keep anything from towels to cotton swabs without intruding much on your clean lines or square footage. This strategy may allow you to choose a smaller vanity or a pedestal sink, and help avoid the use of storage furniture that can easily clunk up a small bathroom.
You might also consider some storage tricks that hotels, like towel shelves located at the far end of the shower.