It deppends, what do you like? Since you posted Persepolis I would suggest you to read Maus and miss pas touche. Some time ago I had the chance to read an issue Vidas Ejemplares, a spanish comic about historical figures of the iberian peninsula and loved the shit out of it.
If you are into science fiction you could read Satania, Gilmanesh el inmortal, Bruno Helmet, Shakespeare ilustrado and Mort Cinder.
