To add to that: Also pay attention to your formatting. A well formatted story can look really bad if there are formatting problems in it.
This is why I strongly encourage you guys to read over your own stories even after I start the voting, so that if there are formatting errors, which can be easily made during conversion to the post, I will be able to change them.
I won't change grammar and spelling errors, though. That's your job to fix those before you submit the stories to me.