You can't see the tail...so I am wondering if it is some sort of sea snake?
The sheen and shape of the head would seem to indicate it may be aquatic.
No idea what it is though.
I think it is the slatey grey snake Stegonotus cucullatus from far northern Australia. The photo in the Ehmann book shows a similar glossy snake bit without the metallic shine. If it is the SG then SnakesNt ( http://www.snakesnt.com/ ) has then for sale for $200.
Incedentally the slatey-grey first came to my attention when one bit Sir Crickey and he desperately leafed though the Ehmann book to find out what species bit him
Scales count seems to low to be a python. All land snakes except pythons have a scale count around 30 while pythons have about 60. This translates as non-pythons scales look bigger.
scale counts are done around the middle of the snake, from belly scale around to belly-scale. exclusive of the belly scale. And it looks like I was wrong with the numbers, it is 35 or more for pythons and 24 or less for other snakes pps:
Non of the Cryptophis nigrescens that I have seen have had that shine and they have had a fatter head. I'm talking about animals in the gold coast area, this doesn't mean other variations don't have that shine.
Here is a photo of a gold coast Cryptophis nigrescens that I took a couple of years ago http://150.101.58.70/thumbnails.php?id=Snake_Small_Eyed_Snake .
This page also documents some foolish behavior on my part regarding this snake.