Just for laughs...

Conveniently placed dove.
What intrigues me more though (IIRC that's supposed to be a paiting about ancient Greek mythology, painted during the Rennaissance period): That spear doesn't look like a bronze age weapon to me. Historically inaccurate!

EDIT: also the original painting is mirrored I think. I have seen it _somewhere_ on the net ages ago.
But now that I think about it.... that could be Mars, not Ares being depicted. Romans had Iron weapons... so it might fit...

 

You are right, I kinda assumed it would be bronze but iron weapons were indeed used by some greek forces pretty early, it could be iron.
The shape is OK (although we can't see the bronze butt-spike that was typical for the Dory), no question.

I found the original btw, it is "Mars desarme par Venus" by Jacques-Louis David and it is newer than I thought, from 1824 actually.
https://upload.wikimedia.org/wikipedia/commons/d/d7/Jacques-Louis_David_-_Mars_desarme_par_Venus.JPG

So yeah.... should be Mars but as you pointed out the beard and spear don't fit too well then, Romans who didn't copy Greek art didn't depict him with a beard. Although Mars is also often depicted with a spear even in Roman art, because the spear is a phallic symbol. They just replaced the typical greek spear shapes with the Pila they were more familiar with.