I use the dodge tool as well, on very low opacity and medium/light hardness depending. For your photo (hope you don't mind lolol), I did the corners of the eye and the actual iris. Doing that helped make the little sparkle a little brighter. I also used the dodge tool set to very low (10) and very soft (20) and did the eye lid between the eyeball and the eyebrow. Just like applying a brightener type of eye make-up, it helps open up the eye.
I did some quick editing to brighten the entire photo. I can let you know the settings if you'd like (I use PSP). I'm definitely not an expert, but with just a few tricks, I think his eyes look brighter and more sparkly.
