There is no rule such that the bathroom lighting should be provided only in the ceiling or is better if it is provided at the sides or on top of the mirror. One has to fix the bathroom lightings according to one's taste and the mood that he or she wants to bring into the room. Even for a small bathroom, people, these days, go for two or more lighting fixtures. Thus, lighting is the most important factor to be considered in any modern bathrooms.
Accent lights are used to bring focus to various details in the bathroom, such as art piece, sculptures or architectural design in the bathroom tiles. These small recessed lights are able to attract attention to these details without taking up excess space on the counter. On the other hand they will help to make your bathroom look more interesting and sophisticated.
Another important aspect in choosing lighting fixtures represent problems that may arise through contact between a heated bulb and water vapour from the bath. Such inconvenience can be avoided if spot type lighting bodies are used.
Task lighting for the bathrooms actually illuminates the area for specific activities like reading, using the toilet paper dispenser, or wash basin. You can have wall sconces at the sides of the mirror in your bathroom. Wall sconces offer extra task lighting; this is something that flush-mounted ceiling fixture cannot offer. Wall sconces use low-wattage bulbs, so there is no danger of the bulbs getting hot and cracking or breaking with water vapor contact.