Star Frontiers is an old sci-fi space opera PnP RPG from 1982. Here's my take on the main playable races.
I changed a few things, like making the legs of the bug-like Vrusk of varied length. I think it transitions into the torso better. 4+4 equal sized legs felt crowded and pointless.
The Yazarians are some kinda tall flying squirrel-monkey. I thought they looked a bit too squat in the original artwork, and I changed the anatomy of the gliding wings to better accommodate for worn gear and melee combat.
The Dralasites are perhaps the most fun of the playable races. They're amoebas, but appear to have a preference for a sort of humanoid, tripod figure.
There are actually two kinds of worms, the S'sessu and Sathar. They remind me a bit of the Ur-Quan. Perhaps there's a connection.
I don't like my Mechanon drawing. It's too greebly and unfocused. The Mechanon's faces are sort of similar to the Mechan's of Starflight. The Mechanon were introduced along with a few other races in one of the expansions I think (Zebulon's Guide to the Frontier?).
I also drew a Queequeg, because it reminded me of a Lovecraft creature. I don't like how my version of it turned out though. There's another similar looking creature that's kinda fun, the Edestekai.
Edit: Added more figures. I wanted the Osakar to be more alien, so I moved the upper torso down. The Ifshnit were generic Dwarves which didn't seem to fit the setting. I changed them into beard-owls. The Humma were plain kangaroos. I didn't know what to do with them, but I thought they should look less like animals trying to handle human equipment. I added some sideburns and SWAT-gear, and erected the pose. Perhaps with some Raptor claws they could be good at close combat.
You can easily find (what appears to be legal) PDFs of Star Frontiers' rule books and expansions online. It still has an active community.