for an artist you're a little afraid

"For an artist you're a little afraid."

"I'm not."

"Then why won't you kiss me? Here, in front of everyone?"

Louis earns his money by modeling for the university art class, in which Harry won't stop talking about how good he is.
Harry seems to be rather self-confident art student, who likes talking as long as others listen to him. Thing is: Louis doesn't listen.

Maybe that provokes that Harrys arrogant masks finally falls?
Or is it something else?