The sheets he has in the last panel are Screen-Tone. Transparent film which pattern/dot is printed on the surface, and you can use it like sticker.
His granddad bought some manga tool for him, ink, pen-holder, pen-nibs, manga paper, and some screentones, so that he could draw more in home. He kept his concentration during 2 hour class. He amazed me! I hope he keeps drawing. :)