The obvious one is that they have to have a close-enough shade match or else it’s hard to wear, but I often mix two shades together, so I am not adverse to that. I’m not a huge fan of really flat, matte and full coverage foundations and tend to reach for more medium, buildable coverage with a natural-to-luminous finish. If it is heavily fragranced and I can smell it once dried down, it would be a no from me.
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