So when I heard the description in the challenge "Nightmare" the first thing I thought of was a childhood nightmare of mine based on the painting you jump into to get to Lethal Lava Land in Super Mario 64. While working on it I noticed some parts started to resemble Bowser so I used some creativity to fuse the two together, which works out because it's a bit more original that way. Funily enough, this thing of my nightmares was already a painting with a frame, but I added some more frame just to be safe.