Here are my comments. I hope they do not sound too critical; they are merely an honest evaluation, by a single person:
The only color variety of Barnavelder recognized by the American Poultry Association is the Double Laced Partridge. Only that color variety is eligible to compete for Best of Breed or further awards. Other varieties can be shown, but they can only receive Best of Variety, since they can't be compared to color varieties that actually have a Standard. If the judge is not familiar with the unrecognized variety, it could be disqualified especially if entered under the wrong name. True, some 4-H shows (though none in my area) focus more on the condition of birds/youth's knowledge and may not be judged by APA-licensed judges, so they might accept your Barnavelder color varieties that aren't recognized. But, even local fairs could be judged by licensed judges and your Barnavelders could be restricted from receiving certain awards or possibly disqualified.
I would personally avoid showing your Ameraucana that has the leakage. It is not desirable at all and he could be disqualified. Judges might consider him to be an "Easter Egger" (impure Ameraucana or colored-egg layer of an unrecognized variety).
Your Blue Ameraucana could have potential, but it is very hard to judge chickens in photos. I'm not seeing any disqualifications just from the photo. She appears as though she might be too small, however. She is still young though and could fill out with age.
Unfortunately, your Marans is not a showable variety. Only White, Black Copper, and Wheaten Maran varieties are recognized by the American Poultry Association. As with the blue laced Barnavelder, he could not compete for many awards and might be disqualified.
Your Brahma could be shown, but I would not recommend it. He appears to be hatchery quality (not bred to the Standard of Perfection, lacks size). I don't believe he will make the correct weight for a Brahma though he will certainly fill out more as he ages. His wing does look possible split or slipped. This can change as a bird grows or may not change at all.
The Salmon Faverolles probably has the most potential. I'm not seeing any disqualfiications but watch the wings carefully since they could be split or slipped. Size could be an issue, if she has not been bred to the Standard of Perfection (looking on the Northwoods Poultry website, they appear to be a kind of a small hatchery instead of breeders specifically aiming for Standard-bred birds).
All the birds are young and can change significantly. Depending on the seriousness of your local shows, you could show all of your birds though perhaps not with satisfactory results.
Have fun raising your birds! 4-H is a great learning opportunity and the poultry project is especially enjoyable.