Geo- There isn't completely a norm- style and taste and overall dec plan would decide.
White dove is a fine color- it Could be used as flat for ceiling and in semi on trim. Typically trim includes doors, windows- cove - anything that would get enameled.
i have seen stained doors with painted trim- that can look nice, but usually not 2 colors of enamel.
Painting hinges is a bad idea. It doesn't stay on well , particularly the moving parts. If they're clean- cut them in or tape them off.
If they're already painted, oh well, for the trouble to clean them I would just do it again.
"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS