I have a Marquez Family crest on my wall, unfortunitly I dont have a camera to take a photo. Picture this:
On a blue background, centered in the picture, there is a (gray) castle rook with two windows, on top of this rook are three additional rooks (smaller)with one window each. They are set to the left, center and right on top of the base rook.
One large gold key is located on each side of the base rook facing away from each other.