My favs are 7, 10 and 11 7 has a lot of action and movement, which would be good for portraying battle, and 10 has a really nice landscape to give you a proper feel for what's going on, and it looks like it'd be a cool landscape too. 11 looks like you're right in the heat of it too, and i like the closeup of the face and hand
i like the design on the third page of sketches of the two (male and female?) creatures near the top left. the spikes on the head, and the trident like staffs remind me of sea creatures and fits together really well. not really any there i dont like.. maybe the very first sketches, of the blobby things with tentacles, but it depends on what they're supposed to be - if they're meant to be a creature, it seems a bit lumpy and boring, though if it's just meant to be like a plant or machine or something then it may fit it better!