Spoiler:
I want to say that the art style is obviously Toriyama's own, but neither of these pieces are collected in the Daizenshuu or Chogashuu. Actually, I take that back. The Daizenshuu-Shenlong is on the last page of every Daizenshuu, but it's very small. I checked Kanzenshuu's Databook Guide, and although it describes the drawing, it doesn't mention its origin. I can see why Shueisha would choose not to include the image in Daizenshuu #1 and #7 since it was part of the marketing ("Collect them all to see the picture!"), but hasn't enough time passed that it should have been included in the Chogashuu like the other Daizenshuu covers? Has this image ever been used anywhere else, but in its complete form?
The Tankobon-Shenlong is almost certainly Toriyama's, as he has used a similar design and coloring scheme at least a handful of times before. I'm actually surprised that this wasn't collected in the Daizenshuu/Chogashuu. It's pretty hard to miss considering it's in most of the tankobon. Where did it originate?
