Well... a face would look good on him
I think the head has less tris then the feet. What you're going to see up close, his face or his feet? I think you know the answer to that one... so the first thing where you should start to lower the tricount is that area + the legs cause they have way too many rings on them. You only need 3 or 2 (that are connected at the back forming one) the rest should go. The palms have a very dense mesh too... you can probably leave the fingers out (if you don't need complex fingers animations... if you will just leave them together it's a waste) and also make the whole palm bigger... check some refs to see the proportions of the human body.
Another crit would be the pelvis area... it's... square. The torso too... although it might be the form of the suit here... you know better
You can reduce the tricount here as well. Usually that kinda of armor doesn't bend easily and even if it does you don't need so rings there since you're not going to bend him in more then 2-3 places.
The best advice I can give you at this point though is look at 1500tris models made by people that know what they are doing and try to see how they are doing it... as in where do they add most tris, how many edges are at the joints... topology in general.