I'm a real fan of the Collins speculum, the metal one whose blades open sideways. There are a few series here with it, and I would really like to see it used more often, instead of the "normal" metal spekulum (it's got a fancy name, too, I think).
In pictures that show the girls' pussy and her face, I would really like to see both depicted sharp. In many of the more recent shots, only her pussy is sharp. But it's so much more fun when you can not only see the speculum being inserted in her vagina, but also her facial expression in that moment.
And a third small thing I'd really like to see is the girls looking into the camera from time to time, especially in the picture series (I'm not so much into videos). It gives me the feeling that they know I'm watching them, which is an extra kick. The best moment for this is when she lays on the examination chair spread wide with a speculum opening her up really wide. I like this "o god, I just realize that hundreds of men will be looking at this picture"-look.
Would be great if you could use these ideas in the shootings!