The leader of the Azorius guild is the sphinx Isperia, currently appearing in Return to Ravnica as Isperia, Supreme Judge. But Isperia first appeared in Ravnica: City of Guilds as Isperia the Inscrutable.
The art for Isperia the Inscrutable was drawn with more background than you see on the card. In fact, it looks like this!
Isperia the Inscrutable | Art by Greg Staples
Back then, the guildmaster was Grand Arbiter Augustin IV. But by the time Isperia came back in Return to Ravnica, the sphinx had taken the position and got a new card: Isperia, Supreme Judge.
Isperia, Supreme Judge | Art by Scott M. Fischer
Isperia's new look also appears on Sphinx's Revelation:
Sphinx's Revelation | Art by Slawomir Maniak
There's another place to get a good look at Isperia, but it's not on a card. As seen in this Arcana, there's a new Magic Online avatar for Isperia, Supreme Judge!