Shelf
Use vertical space lightly.
A shelf helps when it holds fewer things. Too much shelf space can make a small bathroom feel busier instead of easier.
Small Bathroom
A small bathroom feels better when the counter is not the only plan.
The sink is for use. The shelf is for a few small things. The hook is for towels. The drawer is for what does not need to sit out.
Counter
Leave a little blank surface.
Even a small clear area near the sink can make the whole room feel easier to use.
Drawer
Move occasional items out of daily view.
Things used once in a while can still be easy to reach without living on the counter every day.