Toes and fingers really are a pain in the ass.
But you really nailed the fingers on this one, at least that's what I think.
First off, I like the background. I like that you centered the female form and drew these lines, which brings the attention directly to the woman, in the middle.
Anatomically speaking, I'm pretty sure this drawing is pretty accurate. The face/head seems to be a little small, and the arm that is stretched out is a bit thin, but that's just picking peas. I think that's the expression, isn't it? I wouldn't know. Norwegian coming through!
Your use of shading seems to be pretty much spot on, which also looks really neat. Seems like there is a light pointing pretty much directly at her.
Of course, it's a sketch, but I'd love to see you draw some more human forms. You've got something going, and hey, practice makes perfect, doesn't it? You could outline this piece with a pen, try to draw some toes (though I completely understand if you don't), and fill in with colour, if you wish. Which you don't really need to. I like how her hair is the only thing on her body that is coloured.
(Also, her breasts look a bit off.)
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