In TM's case it could be that because you're limited to only 20 photos of a property, less "sexy" areas like the garage aren't shown.
Nope - even in cases where there are less that 20 photos loaded there aren't any garage photos.
I think the fact the garage gets used as a dump to make the rest of the house loko good is likely a major reason now that's been pointed out.
Still sucks that a large proportion of the house is considered unimportant by RE agents.
Cheers - N