If you're requesting cover art/considering doing so, know this: the more detailed your request, the less likely it is to be picked up. Some artists probably don't mind/might even like a challenge, but remember that most artists who pick up a cover request are usually doing so for fun/out of the goodness of their hearts/because they like the story in question.

Do you need a guy wearing a chest plate? Does it have a gemstone or something in the center? That's fairly simple. It only gets complicated when said chest plate also has a fur collar, glowing red tron lines, inscriptions in a dead language, golden highlights, etc. Try to list what you absolutely need, snip some minor details for brevity.

This is just some stuff to keep in mind. It doesn't apply if you're paying for a cover.