For Leonidas (why you have him makes me wonder, he was fairly insignificant, but he's already started so might as well use him) You may want to open the helmet more, possibly to show the front of the cheeks, and have him barechested save maybe a red cloak (retex the cloak of brennus?)
References?
Also, If work hasn't started, might I recommend replacing the Generic "Pythia" with one of the following?
Πύρρος Aιακιδης (Pyrrhus Aiakides)
One of the most famous Greeks of all time, his victory at Rome spawned the expression "A Pyrrhic victory". Pyrrhus was a Molossian, a ethnicity of Illyians in Epirus, long since hellenized. He is known for taking over an Epiric kingdom, waging a war in Italy against the romans and
winning. Although much to his shame he lost too many of troops to hold conquered Rome, and was forced to retreat. He was proclaimed heir to the throne of King Cerranus of Macedon by the Macedonians, and king of Sicily by the Sicilians. Pyrrhus had the option of choosing between the two. Pyrrhus chose to rule Sicily. However conflict with the Carthaginians led to him being forced from Sicily. Then he marches on Rome. Returning from Rome a beaten man, Pyrrhus would need a war to pay his army. So he started one.
Rightful heir to the throne of Cerranus he invades the Macedonian capital and ousts Antigonas II. He wasn't quite content to sit on the Macedonian throne, and left part of his army so he could conquer Sparta, at the behest of his puppet Cleonymus, who would be installed ruler of Sparta. Well in Sparta he was hit off his horse by a brick thrown by an old woman on a roof. Unhorsed he was killed by a soldier. His embarrassments aside, He was perhaps one of the greatest military strategists the world has seen, and one of the most charismatic and influential peoples of greece.
He wrote memiors of battle, which although lost to us, influenced the strategy of Hannibal.(perhaps even teaching Hannibal to use elephants, as pyrrhus had used elephants against the romans to great effect) Hannibal himself also ranked pyrrhus as the second greatest military leader in the world, just below Alexander. Pyrrhus was a highly chivalrous man, reporting to have freed a general and all his surviving troops from their prisons after fighting against a new general. He is said to have told the general to practice and let them go.
Anyways, that sort-of essay is why I think Pyrrhus would make a better greek leader than the pythia
You could also try:
Chremonides Etokles, the athenian statesman and brilliant military commander who issued the Chremonidean Proclamation, which declared the independence of a union of greek city-states, chiefly Athens, Sparta, and Rhodes, from the Macedonians. He was able to rally the southern greek city states in question to wage a bloody war against macedon, lasting from 267 to 261 BCE.
Anyways, for other leaders I have some ideas:
Celts:
Ambiorix: a belgian national hero, he was a prince of the Eburones, a belgian gallic tribe. he is noted for being mentioned by julius caesar, as well as violently resisting Caesar's advances. There's not much to say, except that he's a famous gallic leader who led an Uprising against Caesar.
You could also use Dumnorix, or Orgetorix, essentially counterparts and rivals to Vercingetorix, belonging to the Aedui and Helvetii tribes respectively.
For ethiopia, another leader would be Yohannes IV,or john the fourth, born Lij Dejazmach Kassay. He was a leader of ethiopia of great renown known for being a patriot and martyr. Muslims see him as an intolerant bastard however, as during his reign Sudanese muslims revolted and burned some ethiopian cities, I think gondar was among them. In response to the attacks against christians, Yohannes became a crusader of sorts, fighting against italians and Muslims.
) he never had the power to do it), but this seem more normal Theodore Roosvelt declared war on ...(because he got the political power to do it)
