Example of an analytical drawing from a student. Note heavy use of line in place of shadow. Line is heavily worked - not singular or necessarily definitive. The shape is worked towards methodically and appears even appears transparent.
It's important to be as descriptive as you possibly can when you tag your bookmarks.
I suggest using your first name as a tag and your class prefix as a tag e.g., AR219. This way it will be very easy to sort through what others have contributed on an individual basis and the things that may be pertinent to each class.