This drawing by Terrie Smith (aka Little Paw) was concept art for the cover of the New World Computing release of Inherit the Earth: Quest for the Orb. (The actual cover art was done by Alicia Austin.) The characters (from left to right) are Okk, Eeah and Rif.
Update: Originally we stated that Terrie wasn't in final credits for the game, but we overlooked her listing in the "Special Thanks" section.
Artist: Terrie Smith