Joel posted these for the intended audience, comic book artists, but I think many of the techniques for composition/lighting apply to both PowerPoint and rendering.
Joel Johnson: Wally Wood's 22 Panels That Always Work: Unlimited Edition
Ask any working comic book artist who has been in the business for more than ten years about "Wally Wood's 22 Panels That Always Work", and they know of it like it was the bible.
Once shrouded in secrecy, Wally Wood would selectively give assistants and those close to him three 8×10 photocopies of comic panels that bore the absolute essence of drawing comic book panels. 22 images in total, they held the secret to a comic book illustrator’s success, and those who learned from them benefited from the master’s wisdom.via drawn