My axolotl tends to look out of his hidey-hole and keep an eye on me. If he's out and about and somebody enters the room or I come closer to the tank then he does tend to come to the glass and follow them or me around. He seems to be able to see people from a good metre or so away from the glass, so I guess that his eyesight can't be that bad. I don't know much about axolotl sense of smell, but it seems that their smell is pretty good. From my understanding they hunt by detecting movement more than anything else. Please correct me if I am wrong, of course.