very good post #8 is!
my "educational resource" recommendation would be Visual Storytelling with Iain McCaig Vol.1. his approach is great. the other volumes are great aswell, but id definitely get the 1st at least.
and Composition: Understanding Line, Notan and Color by Arthur Wesley Dow, im pretty sure recommended by dpaint (to give the full line of credit ). its a great book, and for me brought certain things into perspective when it comes to the importance and hirachy of certain picturemaking elements.
my crit is that i dont see much exploration in your "thumbnails".... how about changing the view to a birdseye view, just beyond some of the guys nesting in the branches looking down on the juggler. something like that or totally different. thumbnails are of no use imo, if you keep repeating the same thing over and over with little alterations.
try to explore more when changes cost you little instead of rushing in and having to sacrifice precious details, once you recognize youd have to change certain things to get the picture where you want, impact-wise.
"Have only 4 values, but all the edges you want."
"To any man who has slaved to acquire skill in his art, it is most irritating to have his ability referred to as a 'gift.'"