i like all the photos you have chosen up to know for your drawings. especially this one - her expression seems lovely and natural and comic, and the clothes look fantastic. that your skills are high and really impressive maybe i have not to mention but i do.
She's my favorite ^^ I really love the negative ... dress thing. I don't know what she's holding Haha... But it has such a cool effect. Did you use flash when you took this picture? Also you could play with balance of light in photoshop/gimp.. There are tons of tutorials out there
I haven't used a flash, I've used a surrounding white area, and used 2 lamps and the sun to make it evenly illuminated. The reference photo looks a bit overexposed, but I think that would have been intentionally.
I think she is wearing a black dress and holding a huge sized boa kind of scarf.