Don't know if you could do it, since you are using a previous picture, but Hannibal had a patch over one eye, he lost it in the swamps when invading rome, and also, though there is some argument over this, he kept himself clean shaven so that he would be easy to distinguish on a battle field.
One thing you may want to consider doing with the elephants, since it was a key to Hannibals success in war, would be to give them some kind of defensive advantage or something, as Hannibal always chose the ground for his battles, which is a key to his successes. Would also differentiate them more from other elephant/calvary type units.
As for alternative leaders, Hannibal's father or brother would be keys. His father I believe conquered Spain and his brother was the one that he trusted to keep his enemies in Carthage from betraying him while he was at war.