I really liked the Manga idea. Even more when I read what was in the pages. It's about painting, one of Damian's hobbies from back when he was in the LoA.
There's also the conversation in the manga that resonates with him, about how the character's parents tell him to always have a plan to be the best, but his friend tells him to forget about all that and find his own way.
"Try to paint from the heart." To me, that page means a lot more than Damian's love for Manga. It's a reflection of his journey, and the path that's open for him to take. No Bats, no Demons, just Damian. I like that.
Of course, Damian's like "Nah, you've gotta have a plan." but that's just classic Dami XD.