Beautiful portraits of a petite and feminine lady.
Braid in the hair with soft smooth long hair is a nice combination.
For a small critique, was wondering about her hair line. I know girls have all different hair lines but just was contemplating this one and wanted to make sure that her hairline did look just as you have it. The reason I bring it up is that it has the slightest feel of a masculine hairline, to have the hairline go way back at the temples. I have a friend that has hers go back somewhat like this but not quite this way and with the peak (point) in the front and also on the sides at the temples a peak (point). Very interesting and I just wanted to mention it in case it's helpful.
The other thing was on her right breast (viewer's) as it looks a little bit smooshed on the underneath portion where the middle fold is on the breast. typically the middle of the nipple on a girl (of course, a bra or shirt can pull up more so) is one head length down from the chin. Her breasts look a bit too high. By sculpting the whole breast and then adding the fabric over it, it'll make sure that the breast has just the right shape. Also, at that point, cropping or cutting the edge, underneath the breast to get the shape of where you want the line of demarcation for your sculplture bust can be done.
Just some tidbits and if at all helpful then I'm glad I wrote them.
You are doing a wonderful job on your portraits!