That's such a personal choice. I think that is a popular look. Personally, I like to see a bit of ear lobe all around the pearl on me -- I am waiting for 9 - 10mm Tahitian studs and wonder if they will be too big on me (I have small ear lobes). If you love them, they are perfect!
There are no rules about which pearls are too big or too small. Have the pearls you want. Some people like pearl studs so small they look like they have a smudge of dust on their ear while I like something BIG.
If you like these and they make you feel fabulous, they are the right size.