I thinking they all look like pullets. A roo would have more of a red tone to the comb and these don't. But you can look at the primary feathers to tell, hens usually have a full span of two layers of feathers and Roos have one layer of feathers it's easier to tell when they are littler. hope it helps!!
My hens has a pretty big tail that was "vertical". The roosters had a big tail that was more fanned. That may not be true for all breeds. I had two "roosters" that I thought for sure were boys at 2 months old that turned out to be girls.