I'm building a mockup template for everyone that wanted to showcase their Apple Watch app. Using Figma's variants, this template is supporting all available Apple Watch strap styles and case finishes including the newly released International Collection Sport Loop and 2021 Pride Edition Braided Solo Loop.

Duplicate the file here for free:
https://www.figma.com/community/file/939262190264122872/Apple-Watch-Realistic-Mockup-Template-with-Straps