RESIST THE URGE TO EXPLAIN
The fun of reading is letting your mind conjure up pictures and stories.
Don't deprive readers of that. Say what you have to say with the least amount of words.
Pretend words are money and be economical.
If you write dialogue that goes:
"You pig! I hate your guts and I'm going to stab you in the eye with a screwdriver!"
Do your really need to say:
John was angry and he didn't mind showing it. His voice echoed down the hallowed halls and reverberated back at him. Mary was surprised and frightened. John's voice was not only loud but it was also filled with more stress than the waistband on Oprah's jeans.
No, you don't.
Trust the reader.
They'll get it.
If they don't you're using weak words.
Use stronger ones and stop boring us.