Try to identify a location that offers soft or diffused lighting with natural light. Avoid overhead or bright side-lighting that can cast harsh shadows. If you sit by a window, make sure it is not casting too much direct sunlight.
Phone trick to finding the best lighting: walk around your house with your cell phone, turn it toward you and notice where shadows appear over your face in specific areas, and find which specific spot provides the best lighting. If you require supplemental front lighting to brighten up your space, place a lamp behind your computer and shine it toward your face.