This is a tip I just learned and am guilty of doing myself.
Never describe something that's not there. Describe what is there.
DON'T: There were no trees as far as the eye could see.
DO: Flat planes rolled as far as the eye could see.
DON'T: Unlike the others, he wasn't covered head-to-toe in scars.
DO: Unlike the others, his skin was pristine and untouched.
If you place a noun in your sentence (trees, for example) your reader will instantly imagine trees, regardless of whether you're describing trees or lack thereof.