Here are my hatchery SLW at 2.5 months. I am not all that impressed with their markings but maybe as the grow they will get a bit better. My GLW have much better lacing.
If I had to guess based off color the lightest one would be a cockerel and the darker ones pullets. If, I have it right it is similar to barring genes where the males get two so they are lighter in color. I am new to chickens so I could be wrong, but that would be my guess.
On the first picture Wyandottes should have a rose come and not a single comb but I would say cockerel. The second also a cockerel and the third a pullet. Just guessing though based on the comb coloring. Cockerels usually turn red before pullets.