Dream & Jean
Dream and his siblings often had a habit of just appearing out of nowhere. Most people were usually quite startled and surprised by it, though there were a few who had become used to it that it became the norm. Either way, they never really seemed to care what reaction they got.
Upon hearing someone speak, he turned. Dream knew everyone and Jean wasn't any different. He also knew of her abilities and what she could do. But he was probably one of the few people she wouldn't be able to use her telepathy on as he could simply block it.
"It is quite lovely," he agreed. "I could see it at one of the art shows at the museum." Unfortunately it wasn't up to him, but he did thought the painting was that good.