I think you have a wonderful mini here, nothing too astonishing or over the top. People tend to berate the need for highlighting of black armor but in essence I see no need for it. I highlight my power armor initiates, but I think the terminators have enough detail to draw the eye without cluttering the mini with highlights.
Nice work. Your highlighting of the black armour is noticable yet subtle a hard thing to achieve. I really like the banner and your choice of bone for the shoulder pads, powerfist and the templar logo. You might want to be a little more dramatic with the highlighting of the brass/ gold bits (the chest eagle and crux terminus symbol on the left shoulder) I reckon some very small touches of silver might help it really stand out. Just my 2 cents. Great job, love to see more mini's soon