don't think it has all of the possibles you're looking for....

That headstamp really has me thinking enchi leopard. Enchi usually ends up making a low white pied, but depending on the breeder, that could also be a polymorphic trait from selective breeding.
There are other genes at work here, it's not fire, OD AND YB from what I'm seeing and comparing to some other combos. It may be as many as 2 of the three. I'd maybe lean more towards the YB and fire more than the OD. The fire may also explain that awesome headstamp's blushing.

Good luck!
I picked up a pewter pied last year. Hoping to possibly prove out leopard and sandblast on her based on the only marking she has... a brown and yellow helmet XD;
She might actually be carrying YB too. But I feel less confident on that with how dark her spot is.