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.
Bath lighting must meet three conditions: to be functional, aesthetic and to have a special ambiance. For the daily tasks (shaving, make up, etc.) you needed a strong light and for moments of relaxation, such as a bath in the tub, you need a discreet light. Also the bulbs that you use must provide the amount of light needed to properly light this room.
You can also choose to have natural bathroom lighting. This kind of lighting option is just perfect for small bathrooms. If you have a small bathroom to the right portion of the house, you can have a row of windows above for letting the natural light outside penetrate the bathroom.
Which, in addition, offer safety and a modern bathroom aspect. These spots are available in a vast range of models and so you have an opportunity to choose exactly what fits your bathroom. The bathroom is an intimate area for us and even if it is used for certain activities it deserves to be equipped with special attention to details.