A group of Endermen, from the very first teaser screenshot.
A group of Endermen between Bedrock
Enderman in the plains with a Grass Block
in its hands.
Enderman looking at a player.
What an Enderman looks like.
A group of angry Enderman in The End.
A few Enderman in the End.
An Enderman taking damage in rain.
An Enderman inside of an Orion V bus #6333.
Endermen with their mouths open.
An Enderman trapped inside of Ice
A bunch of endermen in the end, with some holding blocks.
An Enderman being looked at in the Overworld.
Enderman in Beta 1.8-pre2, before it's texture got changed to purple eyes.
An Enderman holding a tnt block.