Lovely, evocative piece. The upper portion of the head disappearing into darkness is especially effective. I would say watch the shapes and edges of your highlights. the hard edged circles on the breasts look like pentimenti for the aureoles. While that intensity of light is possible, the edges should blend more subtly, and for purposes of the shape of the highlight in the indicated areas of the breast, interpret the form of the breast as oviod, not spherical.
Additionally, if the highlight on the breasts is going to be that bright, there will be just touches of almost equally bright light defining the form of the abdominal arch--top of the rib-cage--, and the top portion of the abdominals; also possible at the swell of the stomach below the navel and on the thighs. with the bone just below the surface at the abdominal arch, highlights there will be rather harder-edged, tho still not as hard or uniform as your highlights on the breasts, while the edges will be much softer and subtle on the stomach and thighs.
"Three's so little room for error."--Elwell