Nice light. You've captured all of the important parts here in my humble opinion and I like this. Good soft skin tones and the away glance is all rather good. I also use the sigma 105mm 2.8 - a nice lens, a little slow but lovely to use!
Excelent shot, quality, great lighting and the sepia works well my friend. Always welcome the way of head watching to the side and not straitly to the lens! Best regards!