You said it's a base coat, so it's hard to judge without knowing what your further plans are. The white does look more like accidental overspray, so I'm not sure what effect you'll be aiming for.
If you're trying to make the whole thing look like rusty metal, I suggest going much darker. Then dark rust colored washes over everything, then light rust washes in smaller areas, then to fish it off, dry brush over everything with a little bit of gunmetal. You could then pick out details with other colors, like brass for the skull, etc.
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