This is the state when silence becomes too loud - it's eating you inside and making your brain boil.
The way you dithered the mouth is weird.
Ha, so now we know for sure how do you look like!
I like main idea, face shadows and highlights. But fingers, in my opinion, could use a tini-tiny little bit more work.
Well, first I drew a neck, but then I decided to make it, like you noticed, "floating". A ref was a picture of mine.
I think the head looks like it's floating without a body, because the light cuts off so quickly, instead of indicating her neck or chest. It also looks a little bright (and grey) inside her mouth, I think darker and redder would read better. The darkest color would look better if it were closer to black imo. there's also some heavy banding on the arm due to aa and that grey outline, I think focusing on planes of color rather than band of AA would improve these areas, and getting rid of the grey ourline or altering it so it no longer bands. the sides of the hand could probably use some aa, right now they're the only really jaggy area of the piece. Was a reference used?