Say, say, sjham, way to go on those 30 second sketches! And most importantly, way to go on those 30 minute class pictures!! I really love the amount of vitality and efficiency in those quick 30 sec scribbles.
Again, if I was to give you an extremely honest critique, it would be that the energy is really getting there, but I'm just not getting enough of the distortion of these lines of action of these sketches.
And as for another one, it would be that the proportions and silhouettes of those 5 and 10 minute rough poses are really falling into place, and my totally and extremely sincere advice, then why don't you please loosen up those edges and perception of spaces even more than further on your next goal.
For only the first critique, why don't please relax and grease up your action and movement of your doodles with 155 more minutes of 29 second quick attitudes of the figures?? (155 x 60/29 second, 9300/29=321 scrawls/4 days a week=80 rough and crude sketches a day, in one week) 29 seconds is thru our custom timer on the figure drawing sessions.
The reason why is because of two excuses: First to make your figure poses less rigid, and second to make your bodies more organic, flexible and plastic, and greasy-looking and -feeling in terms of your lines of action and rhythm.
If you wish to make this your current goal, then allow yourself to make that.
Good luck, and have fun with it!