As I just said, Kataphraktoi were exclusively cavalry unit, highly unlike to fight on foot; you should use heavy byzantine infantry (it would be pretty much the same). Apart from that, your painting is AWESOME!
I wanted it to contrast with the previous cover I did for Warmaster Ancients (which I suppose I should get round to uploading) and that oen was all warm colours. So this one got to be snowtastic. Snow scenes are cool to paint anyway, eh? I'm always trying to remember to think about the weather in my pieces as I think it can bring a lot. I forget more than I remember though!
The detail in this piece is incredible. I really love the background with the sun coming up over the mountains. Also, the action of this shot is really awesome, he is really taking on the whole army. Great stuff.