If you're looking for free downloadable watch faces for your Apple Watch, you can do so directly from the Apple Watch app on your paired iPhone. Here's a general guide:

1. Open the "Watch" app on your iPhone.
2. Tap on the "Face Gallery" tab at the bottom.

From here, you can browse and choose from a variety of watch faces. Some of them may be free, while others might require payment or be part of a specific app or collection.

If you're specifically looking for third-party watch faces, keep in mind that, as of my last knowledge update in January 2022, Apple does not officially support third-party watch faces. The available watch faces were limited to those provided by Apple or created through complications and customization options.

Always make sure to use sources when downloading any watch faces to ensure the security and reliability of the content. Keep your software up-to-date and be cautious about any unofficial sources that might compromise the integrity of your device.