I am hunting elk right now with a good friend who's killed over 20 bulls with his compound and this is the first year I can ever remember him wearing anything(!)on his head or face. He's always had a lush head of salt & pepper gray hair and is pretty much of a master elk caller. He's an absolute nut on odor control who maintains quitting garlic, onions, and highly spiced food at least a month before the season is far more important than head covers, and camo. Of course, he is also a great shot and can hit pretty much exactly what he wants at 35 yards.
Me, I'm none of that. I use a camo hat, often leafy or boonie style. I use a face mask or paint if I have time, depending on the conditions...but don't consider it terrifically important if my hat shades my glasses. My range is more limited, and I like comfort foods that taste great!
I cannot shoot well with a "blousy" or leafy mask. It affects my anchor.