Hi @Facer_Official,
One of my watch faces is not previewing correctly in the app. It’s the Vulcan Military Icestorm face (part of my recently featured collection). The blue one is missing details/features. It should look similar to the other ones in the collection. When you click it, it displays perfectly, so it just seems to be an issue with the preview square. Any advice would be greatly appreciated! 
The image is below:
Hi!
Can you try and republish the face without making any changes to it? That will re-generate its preview and may fix the issue. It happens from time to time in rare circumstances.
Thanks! I’ve tried that before and it didn’t work, but I’ll have another go and let you know!