This is looking great, I'd prefer the bottom one, I think? I think is shows a little more detail on the main elements, but I like the top one as well so either one works.

I watched a couple videos on saving the files and followed the advice of saving two main jpeg files - one with shadows only and one with edges (profile at 1 - if you click off profile you loose some curve detail and profile 2 just seemed too dark for me)

Cannt wait to see this evolve and as Francissimo stated the sandbox work is really really nice, great job.