Here are some more.
The more "pure" (exhibition quality) ones are supposed to have dark eyes, but they can vary a lot in the crossbreeds. A crossbreed can be just as black as a show quality bird, especially in the body plumage, but only the best show birds will have solid black tails.
A very nice black mutant, but he shows some pale quills in the mantle area:

Some potential show winners:
