Okay so for the dark brahma breed, the boys are a totally different colour than the girls.
Here is a hen:
and here is a roo:
But besides that, there are pointed saddle feathers from what I can see.
No problem :) but you are right, they do 'usually' have green legs. Which is usually because they come from some Ameraucana and are often mixed with a non-coloured laying bird (with yellow legs) yellow + slate = green for the most part.
I have 5 EE's and two have slate legs, three have greenish...
Since EEs are just a mutt, they come in any colour and have legs any colour. Most of the time they are green or slate, but can be yellow as well. Since there is a beard, it has a pea comb, and the colour is very common for EEs, it is an Easter Egger.
Check out this thread: https://www.backyardchickens.com/t/463817/easter-egger-sexing-tips-and-tricks-pictures-included Here is my boy Stanley at the same age: