I did a forum search for this but didn't find clear answers for portrait photography. I realize that GND are problematic to use for portraits, but I love the look of a rich blue sky that the GND gives as well as the bigger aperture. But, there seems to be obvious problems with using a GND and the subject caught in the density. Also, I how would you expose properly for skin tones and a balance of skin tones with a GND? Can the GND be overcome with flash? Or is the thing I want a polarizer filter? Or, should I invest in a portable power and lug a strobe and umbrella around? Any thoughts would be helpful.