Alrighty, so after a lot of thinking in the car and while doing house chores... I've finally cast my vote. But first, critiques!
CG: The vibrancy of the colors and the vast amount of little scene details is really what stands out about this piece. There's a lot to be impressed with. As my husband told me when I showed him your piece to him "Well, you've lost to him this month! He does way more with his scenery!" (Thanks, husband... I'll deal with him later... *grumbles*). But he's right, you displayed an entire scene and finished it all to the same caliber as the characters, very well done. That being said, there are a couple things that detract for me personally (though please take my opinions with a grain of salt, because it's just personal preference and perspective here). Other than the scenery and a bit with Persephony (who should be called Demiter if we're sticking to Roman gods here), there's not a lot that feels 'Roman' about it. The scenery helps carry a lot, but since Hades (who should be Pluto) is such a central figure, dominating the eye and space, it's hard to tell who he is without the title at all. To me, and I do have a lot of influence from video games, he looks like any number of lich king type characters, but not necessarily Pluto himself. It's a minor quibble, and one that ultimately did not affect my vote, but something you might want to be aware of for future character pieces. You should be very proud of your work and efforts though. It is a beautifully rendered piece regardless of anything else.
Valence: So... for all your struggling early on... way to drop a bomb on us. And I mean that as in you blew us all away. It's a simple portrait, but it's also anything but. You NAILED the aged look side of Janus. The dual color tones too is really well played. So for doing something simple in set up, you knocked it out of the park on the execution of every detail in those faces and lighting. If I had to nit pick I'll say the same thing that my husband tells me 'there's not much scenery establishing where he's at'. I argue with him on this because with portraits, I get concerned with clutter, so, I think what you've done works, but if there was more that could be done to further establish his 'roman deity-ship' whether in attire, symbols or something else, I wouldn't be able to tell you how to go about actually doing it because I would be concerned about detracting too much from the beauty of these faces. Could there maybe more to further sell the concept? Sure. But I don't think it needs it. This is a great piece you should be very proud of.
Atto: This probably had to be my favorite actually. Unfortunately, I could not give it the vote, but if it were finished to the level I know you'd have liked to bring it to, it would have been. I really hope you finish it at some point. The ambience is great, the concept is great, your execution thus far is really spot on, and the story is all there. It has all the makings of a full, beautiful illustration. Keep it up!
Hans: I've always been very partial to your work and this is no exception. Very clean, very well painted. The pattern work is super tight and well done. The only thing is the lighting. The moon is behind her, which makes me want to see her back lit, but the lighting on her face is very warm which is making my brain think 'she's facing the sun'. I'm not sure if that's what you were going for, but it's really the main thing detracting for me. I know I'm also going to speaking blasphemy here, but... on her own, the painterly style for the character is beautifully done. It feels, however, a little at odds with the tightness of the rest of the work. Mucha did a more watercolor type deal, and maybe I'm just being too much of a purist here. I think it's really well done, but it just doesn't seem to fit with everything else as well. Perhaps if there were other painterly elements in the design work or the borders, the moon, it could harmonize better and sorta step in the direction of being influenced by Mucha, but not an exact copy of style, if that makes sense. As it stands, this feels like you didn't want to be exactly like Mucha (which is major props from me, btw, I like that out of the box kind of thinking) but you didn't carry it across other elements of the work to tie it all together still. Again though, this is a really nicely done piece and I hate giving negative feedback at all to anyone's works here because ultimately they're all really well done.
As for me... yeah... when I saw the finals come in, I knew I was out of my league. Hats off to you all!