Minecraft wiki entry for Ender_Dragon, associated text: The first screenshot of the Ender dragon.
The same screenshot, only brighter.
The Ender dragon before being textured.
The Ender dragon before being textured.
The Ender dragon before being textured.
The Ender dragon before being textured.
The Ender dragon before being textured.
The first Ender dragon texture.
The Ender dragon with its first texture.
The Ender dragon's texture taking shape.
The Ender dragon with its first semi-complete texture.
The Ender dragon's texture at this stage.
The Ender dragon with wings more closely resembling their modern form.
The Ender dragon's texture at this stage.
The Ender dragon's head and neck were lowered to make it look more "evil".
The Ender dragon flying over the Overworld.