Lovely portrait, and as has been mentioned, you've got the connection with her eyes.
I would have thought that F8 should be fine for head shots, but F10 looks just fine
I like your composition also, even though the subject is looking straightforward - the offset works.
The eyes need to be sharp which aids the connection, and I think they were a tad on the soft side, hence I did some light localised sharpening, both to the irises and lashes.
Brunettes with brown eyes and pale skin are quite challenging in getting the balance right in terms of exposure, and although the skin tones could have taken a bit more light, it's quite possible that the eyes would have still been on the under-exposed side, meaning some post-production to make the irises/eye-whites bright.
You can do this at the RAW stage, where you convert one RAW image for skin-tones, and convert one RAW image for correctly exposed eyes. You then blend the 2 in PS for correctly exposed skin and eyes. Worth it for a good image.
Final thought would be a hair-light camera right just to add some separation from the dark bg.