Oddly enough, I did a very similar pose in one of my drawings; it was inspired by the song Saint Veronkia. She's got her arms and head hanging backwards over the bed, with a pill bottle on the floor, looking comatose.
I love how your painting create the dramatic mood by the whole scenery and the pose. The color scheme is very subtle yet realistic with the details on the folds on the sheet and clothes and the tones between the highlight, midtone, and shadows. Also, I love how your painting have a contrast on the texture on the sheet and the background as well.
You did an outstanding painting, keep up the artiful work.