[One eyebrow quirks up in disbelief that there's not a single soul who's complained about him. That sounds like the most blatant lie of all. It's almost insulting, even. Before he can make any claims about that, however, that question comes towards him and he shifts.]

My teacher is a busy man. I shouldn't bother him with trivial things like that.

Although it seems like you certainly have a lot of spare time if you're investigating the sketches done in a human's spare time.