There is a wonderful writing sight called So You Wanna Be Published. I visit it on a daily basis.
It is Mary Demuth's sight and she has many helpful articles. One of her weekly postings is Free Critique Per Week and Pitch To Me section.
A few weeks ago I got brave and submitted the first paragraph of my middle grade historical fiction to be critiqued.
She critiqued it this morning. She was kind, but gave me some valuable suggestions.
If you have a first paragraph you want critiqued or just want to visit a very good writing sight go on over and visit. You won't be sorry.
Go down the page a little ways and you will see where she asked for paragraph submissions to be critiqued.