The boss at the top of the Waterall Stage in the 8bit Nintendo game Contra.
Made with PixelHobby beads. Exactly 60,000 beads; a full screenshot, plus a little extra added to the bottom (NES native screenshots are 57,344 pixels). Not made with Perler, Hama, Nabbi, etc., beads. Here's the company's web site:[link]
This has been completed for over a year now, but I started assembling it over three years ago. That's how freaking long this thing took to make. Thirty baseplates, two thousand individual beads per baseplate. Here's a closeup macro picture of a single baseplate, so you can see what one looks like up close: