This is actually quite expressive. Expressive is more important than strict dimesional accuracy. No one ever thought the Vitruvian Man was sexy.
That being said, if you find yourself wanting to sink into realism in art, then the I would recommend to study a drawing methodology that permits quick assesment of the figure from a dimensional standpoint. The man's leg for example is good, but would be great if proportional AND expressive. Loomis figure drawing might be a good anchoring spot for you.
Believe it or not, emotions are much more difficult to convey than strictly academic proportions. With that in mind, you have provided the more difficult of the equation.
I would recommend to study the Loomis method for head construction and find a way to integrate your gestural emotional forms into the more guided head drawing.
Overall this is good. You may find that including more reference lines to anchor the body's dimensions may allow you to be be more relaxed when you start to lend shape to the form.
For example, the base of the spine is not in view in the image, but adding a reference line for the spine from top to bottom will make the proportions of the other parts more clear on a quick sketch.
I would definitely recommend studying the Loomis Method for both head and figure.
