Picture of Heraclius instead of Constantine XI? 

We know Heraclius is credited with the formal side of hellenization, he also emphasized a greek Nationalist struggle in persian wars. I think it is therefore more suitable to put him down as the 'formal' turning point in Roman History when Roman Empire became 'Hellenized' fully.

Also, maybe Nikos Kazantzakis instead of Venizelos? We need a representative of the Arts up there, he is Greece's greatest contemporary author.