In the original Thrawn trilogy, there are frequent references to how unnerving the Grand Admiral’s eyes are. I noticed on my second watching of Part 6 of Ahsoka (“Far, Far Away”) that Thrawn almost never blinks. The few times he does, it is clearly a deliberate punctuation of whatever he is saying. Otherwise, it’s like he is holding the other characters in place, watching them squirm under his examination. It’s a very subtle effect, but really captures that sense of alien intelligence.
And yes—I’m nerding out over this show. I really like it.