First up, one of my favourite figures produced by Citadel in the good old days The Dark Creeper (sold as a Gnome assassin in the Fiend Factory range). What a great sneaky pose
The Skeleton warrior is in a different pose, but wearing exactly the same armour tunic and headband
A quick flick through the Fiend Folio and I can't find any more directly relating to Russ' art (except the Grell perhaps?).