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Sharingan the bloodline is very afraid and are available only for the noble Uchiha clan members. Almost all the tribes that have been destroyed by Itachi Uchiha. Only four operators this bloodline remain. The four people are: Uchiha Sasuke, Itachi Uchiha, Madara Uchiha, and Kakashi Hatake. Kakashi is the only user who does not come from the Uchiha Clan. Sharingan Kakashi only has one eye and has been used to copy over 1000 techniques! The Sharingan is a special type of power in the eyes. It is released through the pupils and requires a large amount of chakra and attention. Sharingan allows the user to copy and see through all Ninjutsu (Ninja techniques), Genjutsu (Illusionary Techniques), and Taijutsu (hand to hand combat). You can tell if someone is using the Sharingan by color users' eyes, which appeared red with small black tomoe.
I found it on Anime forum in internet so i think it would be awesome to be uploaded. For me this tat is look pale, why it is just wasting the space around the back, I hope this is not what he wants, I mean it needs more creation until it results a great art. If I were him I will choose a curse mark that had been own by Sasuke once the Orochimaru marked on his neck that will be niche and simple. Or watch it by design below hope you love it.
http://ladygith.deviantart.com/art/Sasuke-s-Cursed-Seal-27521384