I want to ride MY bicycle....

It is believed by some that one of Leonardo Da Vinci's students in the 1490's made rough drafts of a bicycle. They were found among Da Vinci's writings for the Italian government in 1966 by a group of monks. What is realized with these findings is that in the 1490's all the parts of a bicycle were available to inventors and the public. Inventors were thinking about how to use the parts as well, but didn't think about putting them together.

I am really having trouble narrowing down my images of these.  I could post ALL of them.
Questions we are able to answer:
- How can I find and interesting composition?
- Can I talk about contour lines and show how to draw with them?
- How can I make an object look more 3-D?
- How can we learn from art?