These pieces of artwork were illustrated by Japanese manga and video game artist, Akira Toriyama. The 2 pieces above are from videos games: Dragon Quest & Chrono Trigger, having a constructed art style with both characters and background. The third one on the bottom is from the manga: Dragon Ball, repeating the same I said from the two pieces above, constructive art style with the characters and background; Toriyama has and still illustrates fantastic pieces of art that anyone can appreciate when they see it.