Hello looking for some criqtue please!

Yo, I've been using this website everyday-ish for about a week spending about 20 mins per drawing, I really want to improve my people drawing skills so I thought it would be nice to share and get some thoughts!
http://i.imgur.com/A45Pcm8.jpg
http://imgur.com/A8y3KdJ
http://i.imgur.com/3MVvui5.jpg
http://i.imgur.com/Kyeh0wk.jpg
http://imgur.com/VegHoPR
http://imgur.com/HUiV6PY
Also I've recently started a facebook page so if you liked these dont be a stranger and go over and give me a like! will be much appeciated!
https://www.facebook.com/Alexspeedart

Hi Alex!

Thanks for joining the site and sharing these wonderful drawings with us. :)

What exactly are you looking to get critique on? You appear to have a really good grasp on anatomy and motion already, and I think you understand the concept of practicing these things quite well! There isn't a whole lot I can critique on without knowing what specifically you're looking to improve.

U are doing very fine... Just like sanne said U get the motion and gesture right... but the proportions are OFF so try learning the proportion before U practice these... :)

I think you should try making your lines less stiff and more sketchy. Wonderful drawings but your technique seems a bit rusty- though everyone has their own style.