The inspiring sketches of Leonardo da Vinci

I've had a book of Leonardo da Vinci's paintings and sketches ever since I was ten. Looking at them and copying them has taught me a lot as an artist. He was curious about nature and it shows in his drawing style...the spiral lines he uses to draw water makes you think you can hear it rushing by. This spiralling line also shapes his drawings of men and women.

Sketches for more Shadow Anatomy pieces

Here are some ideas for more on a ' shadow anatomy' theme. I made one piece which was a silhouette made from clay and I showed some organs like the brain and a heart. I don't have a picture right now of it but its in a gallery. I am trying to create some more pieces 'like' that so these are some ideas. I tried drawing with my Wacom tablet, as you can probably tell, which I still feel weird about. It is fun but I definately don't have the same amount of control as over a pen or pencil. Some lack of control can be kind of interesting really and I am not sure how to control the pen sizes yet. How many of you like the tablet drawing tools? I don't use mine a lot so I can't really justify buying a new and more advanced one...