I don't understand what's going on with the O or the three, yellow bubbles. In principle, a happy face is fine, but it seems disconnected from the logo here.
i can rework the layout a bit, i apologize for not including a bit of an explanation. the O is meant to be a head and the thought bubble is meant to show happy thoughts... i'll see if i can make it more clear in further submissions... thanks for the early feedback!
OK, I get it. It was too obscure. #22 still is; the guy looks like he has a horn or something coming out of his head, not a thought balloon. Also, if we're going to emphasize happy I think we also need to emphasize cortex somehow. See #23.