Before you sumbit for centurion though I have some suggestions. Your knee ammo belt is mounted way to high. It should be almost the reverse of how you've put it, with the rivet in the top corner rather than the bottom corner. It also looks like you've put vader dave buttoms on top of the TM ab buttom plates. Remove those and paint the button plates instead. And the 4 buttom plate left of the bigger ab button plate is trimmed too wide. Made it as narrow as the underlying raiser. Pull the drop boxes up a bit towards the belt. As little gap as possible.
You helmet paint job is nice, and I applaude you for your efforts, but the vocoder could use some reworking, and the tube stripes should be closer to the face, not as much to the side on the cheek tubes.