Hello, herb129.
We understand that when you change the attempt to change the face of your Apple Watch via your iPhone, the changes aren’t apparent on the Apple Watch. We are glad to look into this with you.
We would first recommend you Restart your iPhone. This straightforward troubleshooting step is quick and often resolves any number of issues. We also suggest that you Restart your Apple Watch.
Are you able to Change the watch face on your Apple Watch if you make the change from the Apple Watch?
If not, are both the Apple Watch, and it's companion iPhone backed up and up-to-date?
How to back up your iPhone, iPad, and iPod touch
Update your iPhone, iPad, or iPod touch
Update your Apple Watch
If, after following these troubleshooting steps, you are still unable to change your Watch face, we think that unpairing the Apple Watch and setting it up as a new device should be the nest step.
Unpair your Apple Watch and iPhone
Set up your Apple Watch
We hope you find this information helpful.
Be Well.