A great quote found in Wikipedia – origins, Horace.
I must remember to take note of this!
“Your opening shows great promise, and yet flashy purple patches; as when describing a sacred grove,or the altar of Diana, or a stream meandering through fields, or the river Rhine, or a rainbow; but this was not the place for them. If you can realistically render a cypress tree, would you include one when commissioned to paint a sailor in the midst of a shipwreck?”
Check out Purple Prose in Wikipedia