Setup - Do you have good lighting in your video calls?

Lights can improve the general quality of your calls. The best light will always be the natural one from a window.

Here are some tips:

If you have a desk lamp, move it so it is not directly on your face or on a white background to avoid extreme contrasting on your image
Avoid having light (even from a window) behind you, otherwise, it can create annoying glare on your monitor or shadows on your work station
You can have a nice work station with some decorative lights, such as desk lamps
On general principle, you always want the subject to be the brightest and most well-lit subject in the frame

overexposed kitchen — Figure: Bad example - Overexposed kitchen

good video background — Figure: Good example - Person is the brightest subject in the frame

A good tip from The Spruce blog is to position your home office station facing north or south so that the sunlight doesn't throw a shadow at any point during the day, making you move your setup frequently.