This one is my favorite, your gallery has too many nice pictures, I understand why you made so many self portraits, with a model as beautiful as you! You are to me a model of dream and I would really like to have you in front of my camera, you never come to Paris?
I'm always for showing breasts and nipples (as you can guess if you see my favourites), but in this case, I think your breast detracts from the overall quality of the shot. You've got an awesome, innocent face shot with the hair streaming over your breast, very pure and charming; and that nipple sort of ruins the mood.
I'd photoshop it out of the shot, seriously. And again, it's not because of the nipple itself (you've got great tits, as I've seen in other pictures), but because of the effect it has on the composition.