I wouldn't say the station looks like one, but in the context it should be pretty obvious. And it will be more interesting for the originality.
Maybe try to wander further from your ref though?
Your light doesn't read very much as spacelike: light in space is usually of the highest contrast. Shadows are mostly hard black. Check some ISS pictures.
I don't think a too realistic bg would fit, the styles might clash and result in a poor global effect.
I'd suggest to look at pure PA starry skies,
like these.