Hereās a few samples of bone and muscle structure I drew from an anatomy book.

Medium: pencil on a cheap sketchpad.
Time spent: Not really sure. Many, many hours. (Though I can probably tell you which movies I watched while working on the skeleton. Iāve always been able to do that for some odd reason.)
Process & Reference: I had an anatomy book I picked up while in school and decided to get better aquanted with the inner workings of the human body. So I opened it up and began drawing. My plan was to go through each major bone and muscle group and attempt to learn what those where without having to look it up. But, unfortunately, work didnāt allow me much time and before I knew it, I was working on dozens of other projects in my spare time.
But who knows, now that this forum is here to put a fire under my butt, maybe Iāll blow the dust off that anatomy book and get back to it. Great thread Rebeccak!