Really nice stuff, although rather simple for my taste. But I assume they are just some quick gesture poses. How much did you take on doing, in general, one of the drawings? 2 minutes would be a lot for them, considering the simplicity. Too much as a matter of fact. I hope its less. The 4:53 AM drawing (the one with the shading) must have taken you more than the others. Concerning this drawing, I think you should work and practice more on body proportions, because they seem very weird. For example, the head is too small... the shoulders are also very strange, 1 seems larger than the other. I guess the model in that picture had one arm in front of her body. Keep on practicing man, you have a lot of work to do. Take it as my personal suggestion.