The main criterion for choosing these pictures of Ares, Greek god of war was the title of the image. I have chosen those images in which the god appears with his Greek name, Ares. As you can see, most of them are ancient (in the more modern works of art he appears with his Roman name, Mars).
Ares, Demeter and Dionysus, from the East Frieze of the Parthenon, 447-432 BC
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Attic Red Figure Amphora Depicting Ares and Aphrodite in a Chariot Fighting the Giants
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, Suessula...
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The Ares Borghese, from an Original Dating to circa 430-415 BC, 125 AD
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A similar statue:
View of Part of the Melpomene Gallery (Room 15 Classics) with Statues of Ares, Plato and Discophora
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I like the feeling of intimacy of this relief: Ares the warrior come back home from the battle and Aphrodite offers him water to drink (and, at the same time, she does this little gesture of arranging her veil).
Ares and Aphrodite, 5th century BC Relief
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Votive Relief: Aphrodite and Ares in the Presence of a Faithful
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In this modern painting, we see Ares in full armour.
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Johnson, Howard...
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If you click here, you'll find more pictures of Ares, but in their titles the Roman name of the god, Mars, is used.
For more info about Ares, Greek god of war, click here.