a) This is a problem because some helmets are very damaged. These weren't used in combat. Here is an example of the helmet that is too badly damaged (modeled directly on the archaeological discovery - don't take into account changes over 2000 years). The second helmet is well-made, as in ancient times (however of the fifth century BC and not the period of the game, but it is made realistic).
b) Protective equipment of bronze should have a similar color, both helmet and cuirass. The first two pictures are very different color. This is unrealistic. The third picture is correct, the same color cuirass and helmet.
c) Thracian helmet with crest shouldn't have plumes. Plumes are unnecessary on the ridge. It is improper fastening. It reminds 'pickelhabe'. Currently helmets look like this:
However, should look like these:
The mount is really unnecessary and weird. Helmets shouldn't have it.
Or plumes or comb, not together:
Here it is even double, which is totally unnecessary:
d) About this I had once written. However, it hasn't been corrected. Do you agree with me that the CA made a mistake here? Logically thinking - cheekguards are to cover the cheeks and don't block the view from the side.
You can see that CA made the helmet from first photo. The cheekguards are hidden.
However, another image of the same helmet see that the cheekguards are hidden:
It should look like these: