"Find other painters?" Oliver suggested. "Surely there can't be just the one that knows how to do what you're trying to do." And really, he was surprised that there wasn't some place that she could learn this; there were Muggle art schools, weren't there? Why wouldn't there be the equivalent of it in the wizarding world? If a book tried to explain it, somebody had obviously written about it. Somebody else knew. Somebody else wanted the information to be shared.
He was also certain he reacted a little when she mentioned Percy Weasley's name, even if it was just his eyebrow raising a twitch. Really, Percy in a book shop, what an astonishing concept. He hadn't known that Tracey had known Percy, however.