Soulfulness and Mindlessness

For some odd reason (all in my mind)? When HH looks up at me with the pretty yellow eyes, they always look soulful, like she has something to say to me (let it be feed me, give me more water, or change the litter box). Her looks always appear meaning. CC, on the other hand, his stares are just blank. He was looking straight at me but he might as well be staring into the air. It seems to me there was no brain behind those also beautiful eyes. Maybe it's because we haven't bonded as much yet? Or was it because of his young age of seven months?