One of my favourite pieces of RPG illustration, a Black Ssú warrior drawn by Craig Smith for "Swords & Glory Volume 1, The Source Book" published by Gamescience in 1983. It's hardly a lavishly illustrated volume, but the alien races are convincing and feel a long way from being a man in a rubber suit. The Ssú, one of the surviving races from before mankind colonised Tékumel, are understandably not well disposed towards humans.