Correct. In typical circumstances, you would see chipped paint at the edges and some places in the field on "accent coloring." You would also see evidence of wear and scuffmarks on the raised portions of the armor. Other than a few scuffmarks in open, flat areas of the piece, it would be tough to find wear from age and use. Typically, weathering occurs from repeated use and not random outlying events. It seems the scuffing (drybrushing?) is applied in a random pattern or perhaps on any piece of the armor that doesn't already have weathering spaced 2" away. This is a bit too much for my taste. If the wear from drybrushing is not actually from repeated use and from battle damage (ordinance penetration, blast points), consider creating a different weathering scheme using black and earth tone colors (see attached Star Wars model for reference).
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As for the jetpack plasma damage, it feels like you've created more of a tiger-like "stripe" effect you would see on armor from a residue such as oil or something a bit more oily. Since the pattern is carried from one face to the next, it seems forced. Keep in mind the "blast point" effect from before. If you need to physically carve into the armor for the desired effect, I would suggest doing it sparingly and in a similar pattern (see following Chief reference pic).
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Furthermore, I feel the horizontal face of the jetpack wouldn't necessarily be weathered the same as the vertical face on the jetpack since the damage is being illustrated as coming in on two different planes. Unless plasma weapons were shooting at those two faces in the perfect manner to achieve that effect (a very unlikely occurance) and somehow only the jetpack sustained plasma damage, it seems a bit unrealistic. Add that to the fact that the damage on the horizontal face is directly behind the helmet, I would feel as if changes would be needed to achieve that top tier of realism. Plasma damage would seem to have a different weathering technique than colored streaks. Since it essentially "sticks" to the armor and would probably "melt" away at the armor, wouldn't the weathering pattern for that seem a bit more "blotchy" and corrosive than something illustrated through streaks in the finish?