Nice work Jenni, - and mono is a good choice. The high ISO noise gives a nice gritty feel to the image.
As before, a few suggestions:
At f/1.8 the lens will be very soft, as you undoubtedly intended, and as such it is very important to get the focus precisely and exactly right on the eye. To do this, you will need to know how to select the focus point and cmage it so that when you compose the shot, the focus point (the red square) stays on the eye for the shot; in other word, dont focus and re compose. When if download the iage and sharpen, its very clear that the eye was jsut out of focus, and the hair nearest the camera is in focus. An alternate methood, - which may be better, is to simply manual focus.
Ive loaded 2 mods, both with the eye sharpened, and the crop done so the eye is placed on a third. The ear piercing is lost, but you could have retained this by using the camera in Portrait mode rather than landscape.
Mod2, is a version where Ive used a distortion filter called diffuse glow, that enhances the softness of soft focus shots that your may like.
Hope this helps again, and you find it constructive,