Hi. four things you could try:
drill up the barrel holes, add some highlights (lighter blue to the edges of the armour), thin down your paint and watch the angle of their limbs. Because, to my mind, it would be impossible to move your arms that far when wearing terminator armour, since the shoulder pad would simply lock at a certain angle. Go on practicing, for - judging from what I see - you will be able to improve a lot.
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