The Enter Image spell makes no comment on line of sight or line of effect from the caster to the image(s) in question. So using the rules as written, I would have to assume that the caster could only sense through images that are within both line of sight and line of effect of the caster's body, which greatly limits the utility of the spell for spying or other remote interactions. What was the intent of those who wrote that spell description? Did they intend for the spell to ignore limitations of line of sight and line of effect, or not? Was it intended that the caster could, say, place a self portrait in a room where a secret meeting would later take place, and then spy on the meeting from another nearby room, even though closed doors were in the way? That would be in the spirit of what I think the spell is about, but would violate the letter of the rules as written regarding line of effect, especially since it's a transmutation spell, not a divination spell. What does Paizo have to say on this?