Hi Rodrigo. I like very much your art in the Silmarillion. Overall, I think your castles are wonderful! Now, I wish to bring to your attemption a description of Angband'd fortress of Thangorodrim and Gate, that no artist has as yet found, nor guessed in depiction. It is in the Lai of Leithian: “Ever the sheer cliffs rose beside, where birds of carrion sat and cried; and chasms black and smoking yawned, whence writhing serpent-shapes were spawned; until at last in that huge gloom, heavy as overhanging doom, that weighs on Thangorodrim's foot like thunder at the mountain's root, they came, as to a sombre court walled with great towers, fort on fort of cliffs embattled, to that last plain that opens, abysmal and inane, before the final topless wall of Bauglir's immeasurable hall, whereunder looming awful waits the gigantic shadow of his gates." Hope this might inspire you for a new stunning drawing!