This is one of the three full size Ender Dragons on the site, the other two being at https://www.pixelpapercraft.com/papercraft/608ee96bf094ce153b0cddef/full-sized-ender-dragon-72cm and https://www.pixelpapercraft.com/papercraft/58aae19c6a4fd45f694fe1cf/ender-dragon-and-ender-crystal-full-size. The Ender Dragon in the Super Mario Mash-Up Pack is supposed to look like Gobblegut, a boss from Super Mario Galaxy 2. It's also the dragon in Dragon Driftway, a Mariokart course. Also, just a tip, there are 5 neck segments and 12 tail segments. To make it clear, in the mash-up pack, the wings and legs were erased from the texture.

"The Ender dragon is a gigantic flying hostile boss mob found when first entering the End. She is the largest naturally spawning mob in the game and is widely acknowledged as the final boss of Minecraft." -https://minecraft.fandom.com/wiki/Ender_Dragon