This is an allegedly leaked Halloween costume image based on the upcoming Michael Bay-produced movie, and it would be irresponsible of us not to irresponsibly speculate.
Honestly, the only thing that really bothers me about it is the mismatched colors. Orange headband with blue shorts? Yeah, even if I didn't know the cartoon colors, I'd have an issue just because that's a terrible combination that simply doesn't work for anybody (no, not even King Randor). Maybe they got the Mikey mask and Leo bodysuit mixed up, but he does have Mikey's weapons. The nose is a little funky, but I can live with it - it's probably flattened out for the sake of a kid's mask aesthetic anyway.
I can't get all hung up about the shoulder tattoo - yes, human teens should not get tattoos till they've stopped growing, but turtles physically mature quicker. Right?
I guess we'll know if Bay gives them a joke about dick sizes. Because that is something he would do.