The movement is good, but (and it's a thing I absolutely hate to say) the anatomy is wonky. As it stands it looks like the lower body and the upper body are not from the same person and has been glued together. They look good individually, but I have the feeling they don't belong to the same person. Tho I see the drawing is constructed, shadows are okay and give a good 3D feel.
With that all said I would dearly advise you to go back to the drawing block if you're working on a portfolio. The anatomy errors (difference of size between upper and lower body) is not something that will be overlooked at college (at least not where I am). It's a small mistake, easy to correct but as it stands it kills the picture.
You definitely have the method right and you can draw that's for sure, but I would really, really advise you to work on the human body.
Two quick tips that will save you a lot of troubles :
• Always work with a medical anatomy skinless picture in front of you. You can find them easily on the internet, it will train you to draw muscle and get the proportion right
• When your construction is done, do a "transparence test" to see if it's good. Take your paper, face a lightsource, flip the paper and look at it from the transparence. It will make your brain think you're not the artist and will wave away the love eyes every artist look at their own art with, and will allow you to correct your mistakes more easily
Here, I hope it helps, good luck o/