There are 2 ways to do this
1. If you know how design faces on Samsung watch gear designer .. Most if the watchfaces available can be unzipped using winrar app for mobile or PC then you will get all the images and font used for designing this watchface that you unzipped and then redesign it.
2. Second choice is to use the app that supports this watchface that you want to use
One of the best apps is Watchmaker available for Android and iPhone and supports wear is by Google and Samsung smartwatches
Note: for future face requests kindly send your request(s) to admin email “[email protected]” if possible include photo of the requested face would be better