Tried keeping the sketch technique to cross hatching for the most part on this one, building up layers of light strokes and avoiding dark shades.
Incidentally this grave marker could be stylised after the person who was buried beneath, or potentially the Greek war-god, Ares. Like many cultures, Greek gods and humans were in the image of one another.
I can’t say how often Ares would have been depicted in funerary art, however given his status as a lout and symbol of everything wrong in war, I am more inclined to assume the sculpture is meant to evoke the deceased. Athena was the favoured deity in these instances, perhaps because of her more sympathetic tendencies.