1. To heat up the hand. A very loose drawing.
Try to jump all over the figure with fragmented and free strokes.
Then add some landmarks once you are more confident (the belly button, the eyeballs,etc.).
Some modeling just to build up a little bit.
2. Proceed with a similar looseness,
but now try to focus more on shadows, by pressing more on those areas you'll achieve this.
As you can see its a circular way of modeling, were movement is continous.
Try not to separate the pencil from the paper while you are doing this.
Corrections can be done.
Repeat as many times as you want until you are sure the placement of things.
It can be noticed that I repeated the right arm twice.
3.Alternate inner contours with outside contours, modeling and line.
Its better than doing first the outside and then filling the inside.
If its simultaneous you'll achieve a strong sense of structure.
4.Same thing here.
Focus on a part that troubles you or you want to study better, like the left leg on this one.
5. A quick pose.
I've jumped from one leg to another, its fun ha!!
6.Now try to add a surrounding element and do a quick sketch of it, the chair in this case.
7.Again, bit of modeling too.
8.Here I've done my friend Juan who was sitting next to me (I didn't quite got him that's why I did him 3 times), the chair and bit of the model's platform.
9.Finally. Draw the whole space with perspective as much you can see.
This was a three hour drawing session.
I recomend to do it in the morning, you'll have a great hand in the afternoon and paint whatever you like!!