1
Open the Settings App.
Go to Bluetooth and Devices - Cameras.
Click 'Integrated Camera' and check the available settings in there to test if you can improve the image on your webcam.
2
If that does not resolve the problem, open the Camera app.
Click the gear icon at the top left.
IN the Camera app settings, check if you can increase the resolution on your webcam.
3
If you are still unable to resolve the problem, I need to check your hardware capabilities, click your Start Button, then just type msinfo and press Enter, please provide a screenshot of the resulting System Information window.