What is up with the Medina battle one? What are those things supposed to be exactly? Perhaps early Hench and Diablo designs? And why is there a Jet Bike in the Forest sleeping scene? Maybe that was his first idea for the time machine, and they said, "No, think more Eggy. But this is cool too, we can call it something else. Like...Jet...Bike?"
Maybe Toriyama did all these up before they had the game planned. These may all just be his initial character designs or concept sketches. In fact, that would make sense, I just can't figure out why they wouldn't call them concept sketches.
Edit: And I've always wondered about the locale in that Magus battle pic. behind Magus to our right is a building with a gargoyle type structure on top. Could be an early Magus's castle, except there's all those clouds in the background. It makes me think it was supposed to be Zeal, and maybe all Toriyama knew was Magus = from Zeal. I just realized this is way more analysis than preference, but hey, food for thought? Where is that guy? Thought? Hungry? No? Ok...