It's hard to tell on the SLW because those pictures are so small. I started some SLW's last year from day old chicks. Even after they get their feathers, they don't look like the photos you'd see in books. You have to wait until their first molt, when the second set of feathers come in, they will look like a typical SLW. Looking at the small thumbnail, you may have one SLW in your flock but you'll have to wait to be sure I suppose.
Dan