i think youre lying when you say you've never taken classes ;] jk. haha.
your photos are beautiful, and people like to look at people, which is why portraits are always fun to look at and easy to do. my suggestion is that on some of your closer portraits, on alot of them you cut off just enough of the heads and faces to be effective and create interest. on others, you cut off only a little and it just makes it look strange. like, you only cut off a sliver. look at the second photo of Josiane. you just barely cut off thetop of her head, which looks odd. versus the first where you cut off quite a bit and it creates alot of interest. make sure when you look through the lense, you look at absolutely everything you're including and not including. treat it as a canvas, because thats what it is. when it comes to cutting off parts of heads, either keep the whole thing in, or cut off a significant amount. your photography is beautiful, keep it up, youve got talent
=]