Ok, this is what you're heading towards:
First I did the eye. What I didn't expect was that I had to use two copies of it - one to replace the lower edge of the iris, and another to replace the pupil. You might decide that one or both of those steps aren't necessary; I personally didn't like how the catchlight cut through the pupil, you know?
Then this Levels layer for the main flare across the chest and wrist:
Mask it on as carefully as possible, but there will still be an arc at the edge, that will have to be cloned later:
Then this Levels layer for the bit of flare on the throat:
Again, mask on carefully, but again, there will be an edge:
Then add a blank layer above all that, and gently clone those edges.
By the end of the process, my Layers panel looked like this: