Sketching and...sketching

The password of this period is ... S-K-E-T-C-H !!!
Lately I am very tired of my style, so I decided to take pencil in hand and put me to work hard...very hard (but with pleasure) ... I have to admit that the first day my (left) hand was very rusty...damn Digital Tools!!!
I'm trying to work on several aspect of my drawings like: form/shape,rhythm (A.Loomis rulez) and time/speed.