Facer (by Little Labs) is a platform using which designers can create watch faces for Android Wear smartwatches. It was first released on Play Store a while ago and is quite popular among smartwatch owners. Now, Facer has come to the Gear S2, with 22 watch faces now available for Samsung's Tizen-based smartwatch.
You can find watch faces by Facer in the Galaxy Apps store. Out of those 22 watch faces, three can be downloaded free of cost while the rest of them are priced at €0.87 (INR 65 in India) each. For now, these watch faces utilise the default ambient mode on the Gear S2 instead of a custom one, so you'll see a standard skin in the ambient mode.
The developers for the watch face platform haven't mentioned whether they'll release the full-fledged watch face customization app for the Gear S2. We've reached out to the developers for more clarification on their plans for Tizen-based watch faces, and we will let you know once we receive a statement.