Easter Eggers can lay any color egg, not just blue. So technically all the birds in your example would be Easter Eggers. And there are some traits that are common to them and that a lot of Easter Eggers will have, like the green/slate colored legs, pea combs, and beards/muffs, which these birds have. Not every Easter Egger will have them of course, it depends on the mix, but a lot of the hatchery ones will. Also even though EEs are technically mixes too, in my example I guess I was more meaning they could be a mix of a bunch of different breeds, like a barnyard mix. Hopefully this helps a bit.
it is true that an EE can lay any color egg, but it is only an EE genetically if it has a blue egg gene (regardless of egg color laid), to my understanding!