Lighting
You do not want to be back-lit when on a video conference. You want a soft, glowing light (indirect) to hit your face. You want to be seen in natural light if possible, or at least light that isn’t glaring or light that throws shadows on your face. Test your appearance on the computer at approximately the same time of day so you know how to set up your office shutters/blinds/drapes to provide the most favorable lighting.