Hi Andrew_Davidenko,
Welcome to Apple Support Communities.
Does restarting help with smoothing the image? It is a simple step that often fixes many software issues.
Restart your iPhone - Apple Support
- " Press and hold either volume button and the side button until the power-off slider appears.

- Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
- To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo."
If that doesn't help, check for an update as we have recently released iOS 16.02. This will ensure you have the most current version that may address softwares issue: Update your iPhone or iPad - Apple Support
We hope this helps.
Cheers!