Most people don't imagine Winter as an ideal season for portraits, but braving the cold temps will reward you with with a clean, crisp natural light that produces stunning photographs.  The natural light in Spring and Summer can cast a green tone onto photographs, while fall illuminates images with its golden glow.  With careful location selection and reflectors/diffusers as modifiers, the light of winter produces the purest colors of the year.  Even the background devoid of foliage blurs into a stunning mix of tans, taupes and greys that flatter all skin tones and provide a lovely neutral backdrop.  The photographs below were shot in late January indoors using only available window light, and outdoors in late afternoon sun.  

Canon 1DXmarkii and 5Dmarkiv camera bodies, Canon 85 f/1.4L, Canon 135 f/2.0L, Canon 200 f/2.0L, Gitzo Monopod with RRS ball-head, Profoto reflector and diffuser, Westcott Eyelight with white reflecting screen and Manfrotto stand.