face down or his face down or with his face down

[E2e4]

1) The man was lying face down by the side of the road.
2) The man was lying his face down by the side of the road.
3) The man was lying with his face down by the side of the road.

Which of these are correct ones?
Which of these belong to formal and which to informal English?

Thanks

[Bazza]

Why, in (2) and (3) is the position of the head being emphasized?

Single sentences don't give a context.

e.g. The man was lying with his face down by the side of the road. His mouth pressed into the mud, which entered the buccal cavity (=mouth) and cut off his capacity to breathe. He died, not from his injuries, but from asphyxiation.(= to die by being deprived of air)

The context here is that by his face, and so his mouth, being in that position, caused his death.

[Beeesneees]

2 ought to be puctuated:
The man was lying, his face down, by the side of the road - but as Bazza has said, it seems unusual that an emphasis would be placed on the position of his head in this way.
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