Did a photoshoot today, can someone critique me?

To set a faster shutter speed you'll need to either increase the iso or decrease the f stop. Changing the later will affect the composition some what add you'll have a shallower depth of field. Not necessarily a bad thing, I found the background more of a distraction  than a benefit in some of the pictures.

Check your histograms for how well exposed the images are.

Just to add in a different perspective, my girlfriend has worked on the other side of the lens to me, she says from a models point of view, the number of shots from beneath her eye line really emphasises her..... Nostrils! For a models perspective this can make you very self conscious, but she would have been happy with the shoot