The idea of a thumbnail is to very quickly lay out the basic elements of a piece of art you want to make. The appearance of them isn't so important, as long as they get the idea across.
I'm going to put up the four thumbnails I've made for vote. Only the highest voted one will be selected for completion—the others will be archived for use some other time, maybe. Please see the attached file, and vote when you get the chance.
In the interest of keeping a good timeline for myself, I'm going to limit this first poll to 48 hours. For piece 2, I'll try and get the poll up earlier.