I’ve completed three paintings, including one where I’ve fought Legion. I really think they should make this boss harder. I think he’s been the easiest one for me in most Castlevania games. I’ve also fought one of the vampire’s daughters, and then found out they are actually Wind’s daughters (the guy that’s helping me. Right now, I’ve found and entered the fourth painting.
EDIT: I’ve cleared the fourth painting and explored most of the castle. I’ve encountered and defeated Death, and then managed to heal the vampire’s (actually Wind’s daughters) using sanctuary. After healing them, they told me that the vampire (Braunner) is painting a painting that can destroy the world. In order to get to him, I have to clear four other paintings in the next room.