Well Jim....you like blondes with blue eyes, my preference has always been black hair with blue eyes....that's why I married a brunette with brown eyes
She probably wanted someone who wasn't balding.....but..we are talking fish
For sandeels on the flats.....my preference and best success has been olive over white with chartreous eyes....but that might be a confidence thing. On tan over white eel patterns, which I use on sunny days, I use silver/black pupil eyes.
Not sure whether any of that matters, except in the case with shrimp and crab flies....the answer for me there has been prominent/large eyes (black). On those flies, and I've tried a bunch...prominent eyes seem to matter.