@Robgale Thanks--I am also partial to a muted color palette, obviously. And I made a deliberate effort to choose my warms and cools in a balanced way, thanks for noticing. 
@Studiolooong Thanks! I'm pretty pleased with how it came out as well, though I'll be coming back to make a few tweaks.
@Burvantill I love the button too. I think its clear what it is in the larger detailed sketch, but I like how having a second button works in the composition, so both are staying.
@LauraA Sounds like its time to re-watch the movie!
JK. I'm hoping to have a distinctly different look and feel from the movie, so I hope that means I am succeeding.
I really like the silver suit composition as well, I'm having a lot of fun as I'm diving into that one. It feels like a kind of yin/yang vibe if that makes sense, with the button on one side and the little section of the castle with Sophie and Michael almost exactly opposite from it. All I can say is: thumbnailing works, my friends! DO IT! Also, watch @Will-Terry 's re-make of the composition course, it is awesome.
I'm glad you like the woodcut technique--for quite awhile I would tell myself that I need to move on and try something else, but... I just enjoy the process so much. I think that is the point of experimenting--keep trying things until you find something you can commit to, for awhile at least. I'm not bored of the process one bit--in fact, when I get to the point where I get to start "cutting out" the image I get really excited, its where the fun starts in many ways. So, we're sticking with the woodcut process for now. Maybe one day I'll do a tutorial on my process, if that is something people would be interested in. Although I do it all in Adobe Illustrator (vectors for the win!) it could probably be adapted to Photoshop fairly easily.