As far as I remember, only places where Anya got a more voluptous body were in covers (Which are made to be baits, I remember some X-Men blue issue where 15 year old Jean had big boobs in the cover, but in the comic itself she had a small chest, and I think both cover and comic had the same artist), otherwise she was consistently shown to have small boobs and whatnot, even with the many different art styles, so this one stands out, specially considering that Cindy and Gwen are in the same page and they have the right body proportions:
I think it's what I mentioned above, that dumbass mistake from Hispanic heritage thing put Julia by mistake with her old costume, and here we have Anya, with the wrong costume, and Julia's body proportions? Yeah I doubt that's a coincidence.
Also what's up with Gwen's costume? The white parts look weird, specially the hoodie.