Hmm... great start.. I would love to see this as more of a hand drawn thing though and think it would be a great contrast to have each of the two outer towers have a waterfall between them and the main castle. I was kind of thinking that the one on the right would be higher(longer drop), while the one on the left would be a multiple level waterfall affair either spilling into the waterfall on the right, or perhaps on back to the right into the same body of water. Anyway..looking forward to seeing this develop!