After reading the description of the scent ability I was wondering if a creature with scent would be fooled by a mirror image spell when pinpointing that creature as it says in mirror image that the effect is visual only.
Also I was wondering what kind of action it would be to pinpoint someone with scent. The description of the scent ability lads me to think it would be automatic, but when reading the description of the perception skill I was thinking it might be a move action instead as one of my players pointed out during our last session).
Determining which 5' square the mirror imaged person was in, 100% chance.
Same as everyone else (:)), as the mirror images are all in the same square as the caster.
The only advantage scent gives you against mirror image is the ability to know that they've moved away if you were adjacent and closed your eyes to ignore the mirror image. Without it, you'd end up attacking empty air.