Isn't it funny how picky we all are about nipples that turn us on (and I include myself in that)?
For me, big wide areola with the whole nipple rising up to a point in the middle (think: Mt. Fuji) are the gold standard, rather than flat saucer-areola with a dog-end of a nipple sticking out in the middle like an isolated coat-peg.
Even better are the fabled
puffy nipples, frequently on an otherwise small breast, where most of the breast development seems to have happened almost within the nipple. For me, these are insanely sexy
.