Here's my reference pic: https://www.modelmayhem.com/portfolio/pic/30699919

I can tell the photographer pasted her on that background because the edges are too sharp. I was able to get a similar background slightly, but how'd I go about doing it for a full body shot to where it looks natural?

check out the work of Joel Grimes: http://tinyurl.com/c654uv5

Try this

http://www.zarias.com/white-seamless-tu … roduction/

(The background color change part starts about halfway down.)

YW. The post he has about turning the background black by altering the lighting s great too. http://www.zarias.com/white-seamless-tu … -to-black/