Some people like the idea of dividing even a small vanity with cabinet on one side and drawers on the other. Larger items can be stored in the cabinet and small items can be organized in the drawers. If you have small children, you can also place locks on the drawers used to store potentially dangerous items and cleaning substances.
You don’t have to buy decorative shelf brackets - you can make them instead. With a little imagination and some common sense, you could take many household or flea market objects and turn them into creative and unique shelf brackets. Bicycle handlebars, old baseball bats, hockey sticks and children’s toys could all be usable as brackets. Just remember that first and foremost they need to provide stable and uniform support for the shelves that they are meant to hold up.