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.
In giving your bathroom lighting a contemporary design it is very important that you include three categories of lighting, which are ambient, task and accent lighting. Recessed lights, pendant lamps or even rope lights that are hidden can be used to reflect the ambient light instead of using the everyday central lighting fixture in the middle of the bathroom. This will help to give your bathroom some amount of warmth while bringing that sophisticated and modern look to the bathroom.
Try accent lighting for illuminating your bathroom as it accentuates the lighting in your bathroom. This lighting option is not a necessity, but can be used for creating a decorative and dramatic look for your bathroom.