Noble Night online game store is auctioning these original FASA concept art drawings. These were done for Renegade Legion.  I think they ain't bad for 1990, FASA was trying to push away from the "forehead alien", not quite so successful perhaps as Traveller 2300, (pentapods for the win), but pretty thoughtful...yes space lizards, space avians, and space bugs make a showing...but this is space opera after all. Frankly it's hard to do sentient aliens well, you have both biology and some kind of mental and material culture to account for. All inter connected and organically arising from a presumed environment... human social variety is so enormous, and terrestrial biology may be no guide at all...or maybe it is, there are so many organisms here with varied ways to make a living...