My my! The environments in this sb are just GOLDEN man! I really really like the mood on them and I disagree on the lacking storytelling thing. It might be me, but they tell me a lot!
Nice colours and contrasts and, the sketches are pretty tight too!
I would only suggest some statue studies cause, even if the whole thing rocks, the statues and rocks aren't that much believable to me.
On the character desings ( which are cool btw) I'd change a bit the proportions, alotught I don't know if they were intentional, they seem too elongated to me.