Rule No.1
Dewey is on the more natural side, while matte is more on the artificial side.
Rule No.2
You can use everything in an understated way, but if you use one thing wrong the whole thing looks bad.
Rule No.3
Doing a smoky eye can look natural - more natural than let's say a black or red eye shadow eye... You just have to use natural colors - light, medium dark tones that are earthy in shade.
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