/ic/ - Artwork/Critique

Okay, just got my drawing tablet and I'm working on gestures.

How do I improve on gestures? Like the pictures I see here are very defined lines and curves, mine look like retarded robots even when I have enough time to add to the first lines they don't seem right.

I'm doing 90 second timers between pictures, should I be taking more time? How do I simplify the arms legs etc etc into 3 lines like I see a lot here?

Please note this is the first time using my tablet, and i'm just beggining as well. I've practiced for a few days on pen and paper.