If about reward 1-20 badges to best art. I think there are 45% Digital Art, 45% Real Art. And 10% is cake art
Come on now, digital art is "real" art! It's all real art, including the cakes. Maybe you meant traditional art?
IMO, art can be very simple or very complex in its design, but both scenarios could be great pieces of art work. I think art is best judged based on what the image says or the feelings it may create to a person and the meanings behind it which should come through to a person in the work, maybe in various ways.
Personally, I think a portion of the entries are just aimed towards Bitcoin, not entirely bitcointalk. Doesn't mean its bad art, we certainly have some talented people here, but I would have had a different thought process and design if this were a BTC anniversary art contest. All fun stuff to look at though!