How old are your Pekins? this is what your drake will look like when an adult see the curled feather? it's called the drake feather. also the duck quacks loud and the drake has a lower raspy quack.
Welcome to BYC and your ducks are very pretty. I highly recommend Storey's Guide to Raising Ducks By Dave Holderread. also may I suggest adding a few more windows, it doesn't have to be anything elaborate but maybe if they had more air and light they would like it better, cut outs with hardware...