Alexander Mosaic from Pompeii

[hoplite14gr]

Might had his hair tied up as it was customary at the time.
Uncovered head is artistic licence though.
He could have used Thracian, Chalicidic, Beotian or even late-corinthian helmet in reality. and his neck would be covered with a scales "skarf" as the one found in the grave of Philip.
He definitly changed his helmet because it was repotred brocken in Granikos when Kleitos saved from certain death.
Kind regards