What a great idea!!! You still can't get her to sit? Have you tried food as motivational tool? Maybe they take action shots. Seriously, I do think you need to teach her to sit. If she isn't willing to learn, skip a meal, they are so much smarter when they are hungry. Raise the food directly above her head and slightly back, as soon as her bottom hits ground say "YES!!" and give food. You need to remember as soon as the target behavior (sitting) is done, you say the word "YES', and give food. The word "yes" should always be followed by food. This is similar to clicker training, but instead of the "click" they hear the word, "YES." This makes it easier for them to learn exactly what is required of them, which particular behavior is the important behavior. After, they sit like this several times add the word "sit", but hand singles are much easier for them to learn and can be done from father away. Here's a link on tips for taking home photographs, maybe there is something in there you can use.
http://www.yorkietalk.com/forums/sho...t=picture+tips