I envisioned the alien abductors being shrouded in moonless night and yet kind of obviously repulsive and reptilian. The whole thing ended up a little on the murky side but I wasn't meaning to do more than a speed paint so it works for that at least.
This is a simple collage I made from a fifty year old book called The Golden Book of Astronomy: A Child's Introduction to the Wonders of Space. I posted a bunch of other scans on my Tumblr pages Castle Monster and Green Blood Potion.