I don't recall any hints to that? And I've seen the movie a ton of times. It seemed very clear Ares was dead by the end of it.
As for the comics, I'm not a big fan of Ares coming back so soon into GWW's run. But she does seem to be alluding to not everything being as it seems, so who knows. I prefer nice, naked Ares in a tree to straight-forward "rawr I'm an evil warrior" Ares.
The peacocks (symbol for Hera) in the background when young Diana and Antiope spar; there are some animals in the background right after Steve's plane crashes that I don't think were there when Diana first arrived on the cliff; most importantly the bull (symbol for Zeus) that Diana meets just before she sets out to jump the canyon in front of the tower of the armoury.
I'm fairly certain that a really close watch could show some more of the animals associated with the Olympian gods in the movie.
Their physical avatars might be dead but “echoes” of them might still exist. I don’t know, but I’d prefer them to all be dead.