Cockerel or Pullets?

[Welshies]

So I have 9 chicks 7 week olds, mixed breeds. I don't have individual pictures of each.
However some are a little stockier almost, shorter tails. Others are "prouder", longer tail almost sleeker looking, but don't have a red comb. Here's what I mean. (a bad picture, as he isn't standing as tall as normal) his tail is usually a little higher.
I have a few like this. Longer tails.
I can't tell who are roosters and who are hens, only that their appearances are different (but I'm not sure if that's just a variation due to being mixed breed).
Can someone help?
I also included a picture of 3 chicks, you can see the greys are stockier in this one and there's that tall, proud black

.

 

[TattooedChicks]

I’m suspicious of the barred chick, that’s a good bit of comb and color for 7 weeks. The rest don’t look too obvious yet, so fingers crossed for pullets.

 

[Welshies]

It's hard to tell, because my black chicks all look more like rooster. Longer tails, taller stance. Whereas my barreds look more like hens despite a few having red combs. My rooster has a rose comb while my hens have a single.

 

[TattooedChicks]

It's hard to tell, because my black chicks all look more like rooster. Longer tails, taller stance. Whereas my barreds look more like hens despite a few having red combs. My rooster has a rose comb while my hens have a single.

I’d give them a little more time, another month should make them much easier to tell, especially the tall lanky birds.