Here are some sketches of aliens (and a doodle of a Fungi from Yuggoth) from way back in 2005. There is a point to me showing them now; I shall explain in later posts!
Here is an alternative alien idea for Inquisitor or similar Science Fiction game. A kind of holy warrior with a plasma gun.
And finally is a centaur-like alien who lives on a rocky planet or moon(hence his armoured shell) with high light radiation from it’s Sun and a relatively thin atmosphere. He (it?) has evolved to eat sillicates and get nutrients from them and has two sets of eyes for seeing in the dark and the bright sunlight.