Body shapes look nice to me for 8 weeks. Other than that, you have to wait for their adult plumage and won't really know for sure until they are completely filled out at about 10 months.
I don't make my final selection until ducks are over a year old.
They look like 3 drakes to me. Sexing by bill color is unreliable. My Appleyard ducks will have brown heads with their juvenile plumage that then lightens properly when they get their adult plumage, but there is no green tint to their dark heads. I know that Appleyards and WH are a different color and different genetics, but you don't ever see green or black on the heads of the females, unless you are raising Cayugas or other black colored breeds.