It was hard to pick a best 5. But here is a 5. (in the order that I scanned/photographed them)
The weightlessness of sleep.
One of my better perspective studies. There seems to be a guitar body on the next page.
This isn't my best execution because I drew it in a hurry and a moving car. I do, however, like the concept.
Copy of LaTour's Repentant Magdalen. Original: http://www.kean.edu/~jtuerk/images/6_RenaMannBaro/04_BaroquePainting/36.jpg