Thomassss,
The loreal scale is located between the scale behind the nasal and the scale in font of the eye. All of our land dwelling colubrids have it. If you compare it with an elapid, the colubrid actually has an extra scale.
Diagnostic features of a Keelback in addition to the loreal scale are the strongly keeled body scales in combination with the dark edging of the upper labial scales and you can just make out that the angle of the jaw curves upwards.
Great photo - so clear and detailed yet done safely. Well done!