When drawing, ask yourself what purpose the room you are drawing will be assigned to: will it be used to study, work from home, cook, watch TV, do your make-up, entertain your guests, etc. All of these purposes are associated with their unique lighting needs.
Each of these activities require a different intensity, direction and brightness from the lamps. This is what I often explained to my customers: do not only consider one big lamp in the middle of the room to be sufficient. Direct light from one big light source will usually end up disturbing your sight in the evening when a softer lighting is required for our retina to relax and conceal our sleep.
Indirect light is far more functional and effective than direct light. With that in mind, you must never forget to dress your walls, bookcases or mirrors with many light sources. Under just one exclusive lamp for the whole room, there is a risk to cast yourself into shadow if you are sitting with your back to it. Therefore, you should focus less on the ceiling and draw your attention more on the floor and the walls. Try to think where you need “washes” of light, and where you need sharper, more directional lights. For example, so called “architectural lighting” usually refers to lighting that is not designed to be seen, meaning that tall units and bookcases of countertops will provide an excellent place to create a phenomenal “seen-unseen” effect.