Camera Viewfinder for iPhone?

Sometimes I like to take photos at the ground level, but don't want to get dirty by lying on the floor to line up the shot.

Professional photographers have all manner of gadgets to help capture the scene, and I was wondering if the Apple Watch could be used as a real-time viewfinder for the iPhone camera so that I could position the iPhone the way I need to without getting dirty on the floor?

If so, is there a voice command or shutter button on the Apple Watch to then take a photo when I am ready?