What a deceptively simple combination of vignette and art! I really like the earnestness of Harry captured in word and picture. The picture almost breaks my heart, Harry allows himself to feel fear, but he controls it so that he can live up to Snape's opinion.
I also like the nod to canon in this: "You're the bravest man I've ever met. It's been an honor to serve with you." Unlike the books, here, Harry get's to say it to Severus's face, no matter what happens the next morning in battle. Well done, both of you!