Your color scheme, shading and lighting are great. The skin tones are very realistic and I love how you colored the hair. The simple background works with the piece and the colors all work well together. I like how you made the mechanical parts as well.
However, her torso is far too elongated and thin. It's almost as it she doesn't have a rib cage. Her hips however, ever thought it's a side view, seem too wide. The whole lower of of her body is not proportioned to the top. Her thigh is thicker than her waist. Her breast, while the size is fine, the shape and the way it convexes looks a little unnatural.
As for the head, the chin and forehead typically should line up. Her nostril is set a little too far from the tip of her nose. The ear is a little strangely shaped too, I'm not sure if it's how much it curves or if it's the placement of it. I really like how you drew and colored the hand though, very nice and accurate.
With the scarf coming off her back, I'm a little unsure where it's coming from. It's a very wide piece of fabric, so if it was wrapped around her neck we should be able to see it more under her chin.