Project: Blood God

[Tzeentch's Dark Agent]

But I could just buy Red Butchers...

[Rev. Tiberius Jackhammer]

I usually rationalize helmetless marines as having lost/thrown it off during the battle. Kharn starts off with his helmet, rips a couple of guardsmen in half, then takes his helmet off when his lenses are covered in blood :P

Maybe even act that out on the model? Have half a splash of blood on his upper chest/neck, a clean bare head attached to the model, and the other half of the blood splash on his helmet, resting on the ground behind him.

Of course, that's assuming you feel like painting plenty of blood spatters.

[Tzeentch's Dark Agent]

That's how I would do it.

It's currently a draw on Facebook, so it's pretty much up to here.

[Tzeentch's Dark Agent]

Helmet it is!