#11 - Blue-winged Teal, female - dark eye line, spots of white about the eye, white at base of dark beak. For the quiz, she was cropped out of the next photo. It's clear why attention goes to the male - an elegant bird.
Blue-winged Teal, male and female
#12 - Mallard, female - Yellow beak with black on top, yellow legs, dark eye stripe, overall brown mottled. Blue speculum.
#13 - Northern Shoveler, young male - yellow eye and dark beak suggest a young male, though the plumage looks a lot like that of a female.
#14 - American Black Duck
#15 American Widgeon, female - Like the teal above, when the female widgeon is in the presence of a male, he takes the attention away from her, as the next photo shows ...