I put a photo from my iPhone on my Apple Watch se. but tried changing face to something else and it doesn’t work. Have deleted photo from watch have turned off photo sharing. Any help

If you followed this:

Change the watch face on your Apple Watch - Apple Support

and it still doesn't work, then the first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:

How to restart your Apple Watch - Apple Support

Restart your iPhone - Apple Support

If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.

Unpair and erase your Apple Watch - Apple Support

Set up your Apple Watch - Apple Support