I have found that using a temporary color in a lighter shade than my natural color also helps my gray 'blend' in with what natural hair color I still have. My mom and sister's gray hair was/is coarse but mine is baby fine and opaque.Since my 'younger' hair had auburn highlights I choose an 'ash' blond to de-emphasize the red as it makes my used-to-be cute freckles look more like age-spots (double yuck).
Some people don't realize that as a person ages their complexion tone changes and just because we color our hair it doesn't always complement our skin. A change in make-up color may be necessary whenever hair color is changed,either colored or naturally gray/white.
In the end, we have to do whatever makes us feel best about ourself. Sorry so long but I hope this is helpful.