Pretty good take on a mythological varied subject. The tail's a nice nod to Horace and the rest of the "part snake" crowd, and the anatomy on the three dog heads looks plausible compared to many of the attempts I've seen at Hades' dog Spot.
So, we going to get a version with Heracles lugging an unconscious version of Spot over his shoulder for his final labor? Always wanted to see someone sculpt that one. Bonus points if you do a sculpt of King Eurystheus hiding in his pithos while you're at it. Olympus knows he spent a lot of time in the thing while Herc was working for him.