If you are a little confused about where to start, this might give you a good idea of what I'm looking for. Remember, you don't have to upload all these steps at once. In fact, it's best to get some feedback on your sketches first.
1) Thumbnail Sketches The first item you should upload would be your initial sketches. These can be really loose, but should still communicate the big idea. Make sure your sketches are very clear. This will save time in getting feedback from others. Often when I work with an art director, I will simply number my sketches and give a little description for each (usually just a short sentence). Idealy, I would shoot for 6 to 8 ideas. If you are really stuck, you could even just start by writing your selected idiom(s) with an accompanying wordlist.
2) Revised Sketch If you need to revise your selected thumbnail before you go to final, please do. This step is optional and really depends on how you work. As you can see from my thumbnail sketches, my selected idea was very underdeveloped. I decided to do another sketch to flesh out the concept a bit and add in some more detail. For me, the better my sketch, the easier time I have finalizing an illustration.
3) Final art Share your awesome final art! Feel free to share different versions, or in progress work if you are stuck. We are here to experiment, and you can refine this part as much or as little as you want. Don't feel like you have to execute the illustration the same way I did. If you are looking to try a new technique, this might be the place to do it. Have fun with it!