If our eyes were a CCD Camera... (Credits: Stephen Rahn - Tom Buckley-Houston)

This is, of course, a photographic COMPOSITION, but the proportions are exact, and what we would see in the sky if the Andromeda Galaxy were bright enough, would be an object almost as wide as 7 full moons.
The Moon seen from Earth, in fact, occupies about half a degree in the sky. M31 on the other hand, over 2 million light years away, is over 3 degrees wide.