A heavy helmet makes it hard to turn your head
This might seem trivial, and it is in most situations, but if you don't need a heavy helmet, you shouldn't wear one. The more armor and electronics are packed into the helmet, the harder it is to move your head; that much is obvious. There is only so heavy a helmet can get, even on a Leonidas-neck. This is just something to keep in mind as you pack more and more gear into the helmet. The real helmets used by SpecOps are barely over 1 kg.
Why are you restricting the ability to breathe?
Do these soldiers expect to be attacked with chemical or biological weapons? Do they expect to go into the vacuum of space? If not, why would you so heavily restrict their respiration? I don't know if you've ever put a gas mask on, but if you run around in the desert with one one for a few days, it is very uncomfortable.
On the one hand, moisture and bacteria from your exhaled breath will build up in the helmet. This can have a deleterious effect on your lungs after a long period of time. On the other hand, your exhaled breath will also collect inside your helmet and make it generally hot and uncomfortable.
If you want a faceplate for protection, then consider making sure that there it is not sealed (all your pictures look sealed to me) so that there is adequate ventilation.
Is it hot?
Speaking of running around in the desert with a gas mask on, there is a practical vision problem with that, too. Sweat from your forehead is naturally deflected by your eyebrows to the side of your face, away from your eyes. But contact between your forehead and the helmet and/or condensation within the mask can allow seat to get around that and impede your vision. And if it is hot out, a dark colored can on your head doesn't help the sweating situation. Even Darth Helmet switched to khaki in the desert.
This one isn't immediately solvable by ventilation. Any faceplate will run into sweat concerns in high temperatures. If you do all your fighting in Norway, then this is probably not a big deal.
Don't differentiate by rank
That gets senior officers shot. Even in tank combat in WWII, tanks with radio antennas looked more important and got shot more. One helmet should fit all.
Can this mask stop anything important? Is it usable after one hit?
The point of a faceplate is to prevent damage to the face, presumably. Can this faceplate stop a bullet? Maybe 5.56, probably not 7.62 or anything larger (it all depends on angle of impact). No face plate lightweight enough to not stress your neck is going to reasonably stop such an energetic round.
So your faceplate is still useful for stopping shrapnel if you run into a lot of grenades. Do you run into a lot of grenades? Another thing to consider is what your faceplate looks like if you do stop a grenade. I imagine the see-through glass part is now completely damaged, and the helmet will have to be removed. This is the downside of a faceplate: a damaged helmet (penetrated, cracked, etc) is still mostly as useful as an intact helmet. A damaged faceplate that you can't see through is just deadweight.
The real reason for a mask is information
The reason the modern army would consider a faceplate is to put information right in front of the operator's face. SpecOps in particular may find themselves chasing bad guys around town while on the phone with satellite operators who are using powerful tools to track the bad guy's movement. This is a thing that happens in real life.
But here the faceplate damage thing comes to the fore. If you have a cracked faceplate, then you can't even wear it and use the information displays any more. If you depend on the information to do your job, this is bad. Better off to use something like Google Glasses and keep a spare in your pack. Cheap and lightweight means you have a backup option in place.
There is a reason that the modern military doesn't use such things. I can't see any reason to wear such a mask, given the downsides, unless there was an expectation of operating in an environment where you can't breathe (chemical weapons or space).