These 3 toa are part of Project Periodic, a specialized team of Toa that are based off the elements of earth. There are 118 elements, which means there will be 118 Toa.
The pipes on Tarnish are really cool, esepcially in the chest. The others look pretty cool too, but can’t really make out much of Selt, better lighting might help.
The concept is one that has been done time and time again, and yet, each time is as interesting as the last. I think these are really cool designs! I can’t wait to see how you progress!