One of our members on ZU, Deimos-Remus, has put together some well-designed artwork, detailing how characters, enemies, and bosses would look like from the original Legend of Zelda, comparing each piece of art from the original in-game sprites to put together this magnificent collection.
You can view his thread which was created a few months ago when he first started making his art. Or you can check out his entire showcase in the video below, which was made by Zelda Dungeon.
