Some little touches that can make this better ( sorry detail freak here)

Ady,in the slug cave pic you posted in the side you covered the ground you may add a little corner vignette to enhance the "camera effect" because all the other corners have it. ;)

Be careful, if you make look too clean it looks extra fake and breaks the illusion of the environment your trying to create.

Ie its an alien planet, not a sound stage with perfect lighting.

Same goes for the ships.

Remember! Stylised approach

-Angel