Shaggers89, Bluetongue1, I'm not sure if we're looking at the same photos but that is most certainly not a keelback. The most obvious feature that tells me that straight away is that it does not have a loreal scale. It is very clear in all of the head photos that St3v3 has provided that the post-nasal scale is directly touching the pre-ocular scale indicating that it is an elapid and not a colubrid. If you both would like I can go into more reasons why it is not a keelback, however I feel the lack of the loreal scale should be enough.
St3v3, the snake you are holding is a lesser black whip snake Demansia vestigiata, which is venomous and a potential threat to humans. Reasons why it's a lesser black whip snake: 1) head shape, with the tip of their snout being approximately one eye width from their eye along with a slightly rounded end to the snout, 2) the black speckling around the face in combination with the pale areas around the eye and black comma present under eye, 3) lack of the black strip around the nasal area, 4) shape and placement of the head shields (not sure how these look like those on keelbacks), and 5) the body scale shape and colouration.
For future encounters St3v3, I highly recommend that you do not pick up any snakes that you can not identify (or any that you can unless you know exactly what you're doing), particularly has you have done here. While you may have felt safe holding and controlling the snakes head, how you have done so with a finger below the mouth of the snake has put you at great risk of being bitten as snakes can and will bite through their mouth when provoked. With a lesser black whip there probably wasn't much chance of that occurring, however if in future you were to accidentally do this with a species with longer fangs, such as a death adder or taipan, you may not end up so lucky.
Cheers, Cameron