"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach
The rules for any regular literary/art work would apply. Just rate properly and you'll be good. As for posting it, I could see it going in either Other or Art&Photography. You'd probably get more feedback in Other, though.
Turn your demons into art, your shadow into a friend, your fear into fuel, your failures into teachers, your weaknesses into reasons to keep fighting. Don’t waste your pain. Recycle your heart. — Andréa Balt