How are things progressing.
The second pic you posted does look like something is growing. Now the hard part - leave them alone. Do you know expected hatch date?
I have about a 90% success rate having my Muscovy ducks sit on peacock eggs. Last time they consistently rolled one out, and it was not fertile. Don't know how they know but trust them if they are rejecting an egg.
Have you marked the peacock eggs? I do this because the ducks keep adding more eggs and I only want to leave peacock eggs.
I previously posted what I do once the eggs pip. You can hear the chick inside the day before. Last year the ducks killed the first 2 that hatched. This year I was surprised to find a lovely peachick under the ducks one morning. I still took it to brooder.
Post an update please.