The clay golem appears to have some baked shadows; you can see them in particular around the chest and abdomen. I think the stone golems would benefit from having similar texturing highlights.
The original's chiselled abs are a combination of the model having that actual shape, and a texture/normal that emphasize it (the tintmap can emphasize it even further, and is used on the tinted sand model). The shadowing of the original can be added as a layer to another texture, but there has to be some transparency so the original texture doesn't take over completely. The alternative is airbrushing in the shadows, but since that's not a 5 minute process it's better to get your feedback first.
I think that the original texture is fine for a stone golem, it just needs to be desaturated to take the color out, allowing for a neutral gray "granite" look. Very quick and easy to do (tomorrow).
What do you think of the proposed sand golem? I like it's less defined and more flowing texture vs the original. Being made from sand I don't think it should have the well defined muscularity of the original clay golem. What about the unreinforced wood golem next to the sand golem. That looks good I think, like a mage brought a wooden statue to life.
The reinforced wood golem version of the iron golem is really nice because of the angularity, definitely a keeper. I didn't like that reinforced texture on the clay golem where the base model is more organic and rounded. On the iron golem the texture looks like the mage used sheets of wood. If people prefer I can keep the original iron golem's head texture. It's easily separated on the original texture so I could just copy/paste it into the reinforced wood texture at the right location..