This sternguard I try to paint and Heavy weathering. It very unclean. But I like this style. But I don't have idea to paint rusty on power armour or not? In 41th millennium power armour still have rust?? :)
Space Marines never rust! They tend to be fanatical about their armor and weapons. I like the dirty look. It appears he's been kicking ass and bringing the Emperors "wisdom".