Here is an excellent reference on Civil War era appearance for women, including dress, hairdo, accessories, etc.
https://www.amazon.com/Who-Wore-What-Womens-1861-1865/dp/0939631814/ref=sr_1_1?s=books&ie=UTF8&qid=1486506207&sr=1-1&keywords=Leisch--Who+wore+what?
Rather than try to critique your appearance from a not-too-clear photograph (if you are there), I'll just recommend strongly that you (1) purchase the above book, and (2) go online and look at photographs (mostly CDVs--visiting cards made of photos) from the early 1860s. There are a lot of them--study as many as possible!
While the Authentic Campaigner website, mentioned above, is mostly for men, I definitely recommend it for any material they have on women.
Also look up Dorothea Dix's criteria for nurses. You don't necessarily have to adhere to those strict criteria, since not all nurses were under her jurisdiction, but it's a start. Her "no hoops" edict just plain made sense in a crowded hospital ward (as illustrated in the first episode of Mercy Street last year). I do note that most nurses photographed outside the hospital evidently put their hoops on before being photographed!
Of course all the references in prior posts here are excellent! I'd also recommend Mary Livermore's
My Story of the War. As a US Sanitary Commission supervisor for the Midwest, she did a lot of everything, including nursing and other hospital work (dietary in particular).