Hey yael104,
From the photo, this is likely a hardware issue with your Apple Watch.
We'd advise a restart of the Apple Watch and if the purplish hue and faded image remains, contact Apple Support directly for assistance.
"Restart your Apple Watch
Learn how to restart your Apple Watch, even if it isn't responding.
How to restart your Apple Watch if you have watchOS 9
- If your Apple Watch is charging, take it off the charger.
- Press and hold the side button until you see the power button in the upper-right corner of the display.
- Tap the power button.
- Drag the Power Off slider.
- After your watch turns off, press and hold the side button again until you see the Apple logo.
How to restart your Apple Watch if you have watchOS 8 or earlier
- If your Apple Watch is charging, take it off the charger.
- Press and hold the side button until you see the Power Off slider.
- Drag the Power Off slider.
- After your watch turns off, press and hold the side button again until you see the Apple logo.
Force restart your Apple Watch
You should force restart your Apple Watch as a last resort and only if it's not responding.
Don’t force restart your Apple Watch if you're updating watchOS. After you see the Apple logo and progress wheel, leave your watch alone and on its charger until the update finishes.
To force restart your Apple Watch, press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo."
See contact options for Apple Support here:
Take care.