Welcome abaord, Noku.
Say, you're doing a mighty swell job on your fluid poses and gestures, but these forms and relationships and spaces, in my mind all seem a bit too rushed, because you seem a bit too impatient with yourself and your poses. How would you like to please do your first ever 1 hour class mode, therefore, on the longer drawings, please measure out the head lenghts with your pen and fingers?
As a result, your understanding of relationships will become more masterful with each new attention paid to each proportion and angle of your figure bodies.
Good luck to you.
P.S. Please pick up a copy of Andrew Loomis'
Figure Drawing for All It's Worth as a free PDF
here!