I think it is a mistake to spend a paragraph or two describing a person in your story. We want to learn about this person as we read the story, just as we learn about someone in real life.
We can describe a person's looks as soon as we see him. And we can describe the person's voice as soon as we hear him speak. But it takes a while to understand the motives and actions of a person.
A recent assignment I gave my students was to help them give the reader a good image of a person without overtly telling the reader what he looks like, sounds like, thinks and does.
Put two people in a setting together. Let them have a conflict. Have the two people work out the conflict and resolve it. In doing so, help us to see the two people and understand why they feel as they do and why they act in a certain way.
As author, Terry Kay, said at our recent conference, A Day for Writers, there are three major players involved in your story. One is the author, second is the characters, and the third is the reader. What we leave out is as important as what we put in. We can show by the character's actions and his words that he is angry, loud, a bully and more without telling the reader, "he is angry, loud and a bully."
Describe what the character looks and sounds like when he is angry, loud and his actions when he is a bully. The reader will fill in what you leave out but you give the clues.
In a short story I wrote, Big Al grabbed his ex-wife's wrist and squeezed it, hard.
He yelled at the waitress complaining about his food.
He demanded his ex-wife come home to him, and later threatened her.
He ran his hand over his ruddy face.
He laid his cowboy hat on the seat beside him. He opened the two top buttons on his cowboy shirt.
The reader creates in her mind just what Big Al looks like from the actions taken and the type of person he is.
My students wrote some excellent short stories with their two characters and their conflicts. Maybe you can do the same.