I am curious why my face looks duller when I wear makeup.

There are days when you clearly apply makeup to even out your skin tone, but your face actually looks even duller.
I thought my skin tone would naturally brighten after applying the base, but as time passed, it actually felt like it looked duller.
At first, I simply thought the cushion color didn't match.
However, even though it was the same product, some days it was fine, but on other days it felt particularly dull, which made me even more confused.
I was also curious whether applying too much base makeup causes it to pill, or if it is largely influenced by skin condition.
After hearing that skin condition is important before applying makeup, I became even more concerned.
I am particularly concerned because my skin feels like it looks darker overall by the afternoon.
I am not sure of the exact reason, whether it is due to oil or oxidation.
So these days, rather than focusing on how to apply makeup well, I’ve become more interested in understanding why skin expression changes.
I'm also curious if there are days when everyone wears makeup but their face actually looks dull.