I like the breath of your ranges, but there are inconsistencies. When I initially see these I think they are in 15mm. I find your Roman range to be very static, but also if they were 54mm they would make excellent chess pieces for a Roman Civil War chess set.
Your latest offerings of chariot era warriors look very nice and have well scaled heads, hair and proportions and some very lively poses which will be very cool for skirmish games. If I was into that period I would paint those. It is strange that SAGA and other skirmish rules seem to do the chariot era last, when it should be the opposite. Odd that the Trojan War has no end of miniatures and different scaled rules to play games in. Good luck with your ranges, I hope your Hittites et al start up new interest.