Hello. I see none of the more knowledgable breeders of this beautiful variety of wyandottes has commented on your post yet so will give you my opinion of the best ones. I am by no means an expert on this variety but I have looked into getting some quality ones in the past and may in the future. So I do know a bit about them.
I would recommend culling #1now as she is a narrow bodied bird with a narrow head and narrow between the legs and looks a bit cow hocked though that may improve a bit as she gets older but I doubt if she will get wider. She also has no depth of body. Her lacing is narrow which you can see even more so in the front shot where new feathers are coming in. She most likely will not get much better in any of these areas.
#2 has potential to be a very nice bird. She has good width of body, a nice wide head, and good width between the legs as well as good depth of body. She has good width of the lacing on her feathers which makes her color look darker than the #1 bird. Her feathers are in various stages of coming in yet but they look like the lacing may be pretty good.
#3 is a decent bird though it is hard to tell as she didn't want to pose for the pics. In the first 4 pics she looks a bit narrow and could use some more depth of body and more length in the breast bone but in the last pic of her she looks much better. I would recommend keeping her a bit longer to see how she develops. Her lacing is narrower than #2 and #4 but not as bad as #1. Her lacing looks pretty good in the front shot of her and she looks correct on her legs. Her tail right now doesn't have much lacing and is mostly black and there is a white feather at the bottom of her wing that the others don't have. I'm not familiar enough with the variety to know if these things will correct as she gets older and her adult feathers come in. Maybe some of the more knowledgable breeders could give you a better idea on her.
#4 Looks very nice with a good amount of potential. She has very good width and depth of body, a nice wide head and good width between the legs and looks correct on her legs. Her lacing looks pretty good though she is getting new feathers in various areas which makes it hard to tell but to me she looks like the lacing will be pretty good. Again the more experienced breeders should be able to tell you better on the lacing than I can.
So as you probably have guessed #2 and #4 would be my pics to keep.
Hope this helped you out a bit on who to keep. I look forward to see if some of the experts in this variety comment and to see what they have to say.