The food IN the picture is what is judged I believe. Usually those entering take pictures of the process and after the winners are announced we then post our entry with pictures of the process. I don't think that is mandatory, however. It's just nice to see more details after the fact. Scroll through some of the previous ThrowDowns and get an idea of what has been done in the past. Admin also puts a brief description, provided by you, under your picture.
Here are examples of the throwdown winners page and my entry for the September entry last year. Maybe will give you guys ideas.
Darn.............I was looking forward to seeing your entry
Maybe you can enter the next one.