Am I a candidate for "squint surgery?" I was told my case is rare. (photos)

You need a real consultation to determine precisely what your concern is.  The photo you put up shows no evidence of lazy eye nor evidence of ptosis which is sometimes mistaken for a "lazy eye."  A lazy eye refers to amblyopia with an eye that does not develop normal vision usually do...

Your photos indicate that you may have mild lower eyelid retraction [white showing underneath your cornea-"scleral show"].Strabismus alludes to misalignment of the eyes, or "crossed eyes", which your photos don't show.

Strabismus or "crossed eyes" is a recognized complication following blepharoplasty.  The cause can be either due to postop swelling in which case the strabismus will resolve as the edema dissipates or it can be due to direct injury to one of the extraocular eye muscles that control eye...