These all look excellent @IllustriousVar , but from a set prospective, I'm not sure the accents on all the Toa work. For example, Kopaka looks like he has yellow elemental energy flowing through him, this is a color associated with warmth and doesn't convey ice. This is messing me up while trying to make sets as he looks out of place. Pohatu and Onua are the only two that work well when associating them with their elemental energy colors.
Here is a recolor that I think fits better for Kopaka. Unfortunately the solution isn't as simple for the other Toa.