If you have already a big scanner what I suggest to do is to reproduce line per line the entire drawing on a smaller scale, on a paper that'd fit the size of the scanner, or to buy a graphic board and draw it directly on photoshop or any other graphic program.
Regarding the new drawings, really cool. I f'in love the teeth. Although I prefer the older eyes (v2), they look more primordial and how to say, distorted. But those new ones are really sweet indeed. They look pissed off. Now that I think of it, you could add some further details to the horn, because it looks too flat compared to the rest of the body, full of all kinds of details. You could do some little crests on it, little and random little horns or protuberances that grow out of it (sort of mutated looking), some carvings with a distinct subtle drawing into it, or again make it something particular, make it open like a grotesque flower to reveal something.
Also, while browsing your DA profile, I found those "Defiler of Innocence" drawings that are really sweet. Almost lovecraftian.