I'm an artist (not a Subeta artist, I mean just in general) and I have to agree that saying "These two are outdated!" without explaining exactly what you don't like about them isn't very helpful. If you don't like the art, it really really reeeeeally helps to say specifically why you don't like it, so the artist knows what to change (or at least consider changing). I can't speak for other artists, but I don't have psychic powers that allow me to magically guess why a total stranger wouldn't like my drawings. Simply being old art isn't a reason by itself, either - I still get favorites today on artwork that I drew and uploaded to deviantart over two years ago.
Personally I don't think that either pet is such an eyesore that it needs updating right away. And even if they were, like other people have already said, I assume the artists would know about it and it'll eventually get done.
You might have had a valid complaint if the Subeta artists just sat on their hands all day. But have you seen the news lately? New items have been released. Kerubis just got a makeover. An entire costume trunk got revamped. All of this tells me that they are, in fact, working. So...just chill out and enjoy the rest of the site.
![Smile :)](./images/smilies/icon_smile.gif)
If those pets need new art, they'll get it in due time.