I pull the eggs when they first started to crack and had a bin step up in our kitchen with a heat lap and damp towels. We don't have incubator, I would have too many ducks and chickens then.
I will try to get new pics this week-end.
I have a Pekin female and a Rouen male and here's what I got.
It's an old pic. One looks like a Rouen female and the other is black and white. They were a few months old then.