Guide
A pet watch face for Apple Watch
A pet photo already has the contrast a pixel face needs: eyes, ears, and a simple background.
Shoot for the face
One animal, facing the camera, with a plain wall or floor behind them, survives pixelation better than a park full of other dogs. If the fur and the background are the same color, the face turns into one blob.
Keep the watch readable
After the pixel conversion, check that the time or calendar still sits on a quieter part of the image. Brightness and grain in Pixel Faces are there so the pet stays visible without covering the clock.
Open it on the wrist
Sync from iPhone, then open the Pixel Faces app on Apple Watch for the full-screen view. It is a companion app, not a face in the system watch-face gallery.