So I started drawing an alien and just continued. I have not a clue what he's doing, or what the background should be but its just black for now.

good glossy material; the shading is really more "volumetric" than the piece I saw of you before.
Maybe thin low opacity layers of glazing ( multiply , or overlay ) can deep the shading, and make it more photorealistic. Just a suggestion

Wow, that looks like a glossy sculpture! Awesome!
I think the alien is contemplating whether he should get some botox injections.

Deevad: Ok so I added some shadows and stuff with overlay layers... I dunno can't really get to grips with it. It felt like I just wanted to go back to ctrl+click-picking out colours and then darken them. But I'll keep at it. Any other pointers?

Valerievk: Thanks. He/she would really need some botox - I added a demonstration instead though. An anti-federation/anti-terran demonstration

I can only say COOOOLL!!!
We are really gressors..
We conquered this planet.

Whoa, that looks even better with the background!
Heh, now it looks like an old alien saying "Get of o' mah lawn you darn Earthlings!"
Anti-immigrants everywhere.