This app was mentioned in 8 comments, with an average of 1.25 upvotes
I don't install many apps because I'm ok with the defaults so I can only recommend a watchfaces app PhotoWear so you can put the picture you want in your watch
Great watch face if you want your own photos to show up. It lets you choose up to 9 photos to rotate through each time you check the time (configurable).
Mine currently looks like this with photos of my daughter rotating through.
I like Photo Wear. You can choose 9 photos out of the gallery, and switch among them on the watch.
https://play.google.com/store/apps/details?id=com.sparkistic.photowear
Try this app, I haven't tested of my side but maybe it's that you want:
https://play.google.com/store/apps/details?id=com.sparkistic.photowear
I tried Facer briefly but it was just too much for me as the app itself was very busy and I did not really find a lot of faces I wanted.
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Mobvoi has free watchfaces: https://play.google.com/store/apps/developer?id=Mobvoi+Watchface&hl=en_US
I downloaded 2 and neither seem to really affect the battery life. A plus is that they do not require an extra app to be installed on your phone & smartwatch.
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I also use PhotoWear sometimes: https://play.google.com/store/apps/details?id=com.sparkistic.photowear
I do not notice any battery life changes with this one either.
I've been using Photo Wear for a long time. It's in beta still.
https://play.google.com/store/apps/details?id=com.sparkistic.photowear