When SOE first designed EQOA tank armor it looked like an egg carton. To get an understanding of what I mean, take a look at the back of these characters:
Again, on a female character:
The helmets were one of the things that took the most notable change. They went from rounded, to edgy. Here are some old helms.
Another old tank armor photo…
Then Frontiers released and it got… smoother?
And from the back… Frontiers gear: