In Reef Fishes of the East Indies the only scorpionfish with bright white patches and the prominent tentacles above the eye is the raggy scorpionfish (Scorpaenopsis venosa). The description indicates that "tentacle above eye often present and up to twice orbit diameter in length". That suggests the tentacles can be absent and many imaged labeled as S. venosa indeed lack the tentacles. Fishbase describes the appearance as "Adults are best recognized by the tiny light-blue ocelli scattered over the body, and dark triangle below the eye. Small juveniles have three distinctive white spots along the back". Finally, I think there is a very good match with the image below, which was also IDed as S. venosa.
Too bad you didn't get a better image because this colour form seems to be rare, or just rarely photographed.
Thanks! From what I remember seeing with my eyes, and comparing it to my photos, I think the raggy scorpionfish in that stock photo looks to be the most likely culprit.
Sadly I'd been shooting supermacro on that dive, and only saw this critter at the end of the dive just as the current started ripping over the top of the reef and I was totally unprepared. Didn't have time to mess around with lenses
This is the only other shot I got of it, not really much better than the others to be honest. Not sure if it will help any further.