This is a really good one And I have just realised that it might not be so much "How well you know Tasmania" as how much do you pour over everything in this forum.
Well there are a few parts I don't pour over, but I love the photos and there is at least one good shot of this spot from a different angle. I would like to suggest you are on the side of the Boomerang overlooking Lake Sydney. I suspect you were either on the way up or going down - so how high is that scoparia?
I think you might be looking southwest toward Mount Oakleigh from about halfway between Cradle and Barn Bluff on the track to Barn Bluff. Probably closer to Barn Bluff than Cradle, somewhere before the climb up Barn Bluff begins. If I am correct I will pass my turn on to someone else as I don't really have any suitable photos.
Well done bushrunner Its just past the hill in the middle of the track to Barn Bluff. Some may have noticed the track and helipad at Waterfall Valley hut in the photo.
So the invite is out to anyone to contribute the next photo. {PS - The photo you did submit was a great brainteaser - thanks for putting it in}