You have done a really good job on them, I also like seeing what colour schemes people use on the miniatures.
The armour colours for common troops were black,red,brown shades, and rust protected. Nobles also used the above plus gold,silver, copper, and flesh coloured.
If I paint the ishida I will use mixed colours, just because most clans had no uniform look.
but sometimes one type of armour was specialized in an area just like in medieval Europe, such as the Date clans use of bullet proof armour. So if you kit your troops out in the same breast plates or lacing styles you could have a kind of uniforminity even if the armour and lacing colours were different. Also you could do one or two bases as household troop in a well equipped uniform style.