I’d like to give a quick shout-out to the NC-writers.org, which—among many other valuable services—offers a critiquing and editing service for writers of all stripes (essayists, poets, fiction writers, screenwriters).
I’ve used this service a few times for short stories that felt a little “off.” When I’m having trouble with dialogue, or feel that I’m getting bogged down in heavy passages of description, or I’ve tangled my characters in too much back-story, or I need an authenticity check-up, I can ask for help from an experienced editor with a sharp pen.