I thought it had to be a combination of two images, perhaps taken with two different lenses, but it seems like the photographer used a zoom lens, for a wide angle shot, then zooming in to M31 for a close-up, and then combining them. Pretty cool.
The astronomical image seems way out of scale with the mountaintop.
The scaling does seem distorted, but the Andromeda Galaxy is a large object in the night sky. It’s just diffuse so, at best, the unaided eye only detects the core.
The apparent size is about 3x1 degrees, the moon is about 1/2 degree; so overall about 6 times the size of the moon. It’s coming for us (in a couple billion years).
I wish it was as big and as visible as that picture.