I thought that it would be useful to have a few alien civilians for my sci-fi games. CP Models have some nice ones and this pair come from their "Spaceport Scum" set.
On the left we have what I have painted as some sort of fish-person. The skin has been painted with a blue/green/silver mix and a thin purple ink wash to try and give a scaly effect. I imagine that the nozzles either side of the chest are misters that keep its skin moist. On the right is a hefty but short individual that could perhaps be a heavy-worlder.