He'd wait, listening and watching patiently, wondering just what exactly was going on with the girl, who couldn't be all that much younger than himself, in front of him. However, giving her time and a bit of space allowed her to... calm, or whatever she was doing.
The first part would be... Mostly ignored. Obviously he was an amazing artist, not that he was about to dance around and gloat about that.
A nod in conjunction with an "Un." would be given to her question about his opinion on her sketches. "I didn't see a lot of styles like that in university, but there are many comparable works in the book shops."