So we originally thought that the wielder of the mangekyou sharingan made the type of jutsu on the eyes.
However considering itachi was said to have killed shisui, and shisui had a very powerful genjutsu (assuming he didnt have mangekyou also) it appears itachis tsukyomi could have been made simply because he killed shisui.
Maybe the eyes see the person theyve killed and take the skills from them and make them much stronger.
Tsukyomi is just seemingly a stronger form of shisuis mind control
Amaterasu is just a stronger form of great fireball jutsu, which was the pride of the uchiha clan
Susanou we dont know what he does yet, so not sure about that....
However considering itachi was said to have killed shisui, and shisui had a very powerful genjutsu (assuming he didnt have mangekyou also) it appears itachis tsukyomi could have been made simply because he killed shisui.
Maybe the eyes see the person theyve killed and take the skills from them and make them much stronger.
Tsukyomi is just seemingly a stronger form of shisuis mind control
Amaterasu is just a stronger form of great fireball jutsu, which was the pride of the uchiha clan
Susanou we dont know what he does yet, so not sure about that....