Set your Apple Watch System to allow Live Photo to work.
Tap: Setting -> Display & Brightness
Turn off: Always On
Open Watch Face+ App on your iPhone and choose the Live Photo to set.
Tap: +SET LIVE PHOTO
Open your Album and click the Live Photo you downloaded.
Tap: Share -> Create Watch Face -> Photos Watch Face -> ADD
Turn your wrist and your Apple Watch Face will work the live face you set.