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We show you how to get fully working custom Apple Watch faces on your watch, Install the app from here, when grey tap the icon once for it to begin installing. Make sure your watch settings are set to keep last app used for this to stay on watch permanently or it will automatically switch back to the previous face (thanks to Jonathan Andrews for reminding me of this detail).
If you want more selection choose this link it will install over the first one. You can choose the faces using the crown on the Apple Watch.
In the watch app go to general – wake screen and keep Last app as always.