Here is the illustration that resulted from my latest YouTube video, "Time Lapse Drawing: Realism Challenge-- Mushroom." In the video you can see clips from every step in the illustration process, from first pencils to finishing touches: [link]
I've taken the unusual step of including a ruler here, since my decision to do the drawing at the exact size of the real mushroom made for a very small working area: Good practice for pushing one's control of the drawing and coloring media to the limit.
Some commenters said they wished I'd put more time into it so as to get a more realistic final result. I think they're right, and next time I undertake such a project I will strive to do better.