is there a way to recover deleted pictures taken with my iPhone and deleted from PhotoStream

Not unless you have backed up your phone to iCloud or iTunes.

If you just deleted them from photostream they could still be in your camera roll.

Here's general advice:

You should be importing all pics taken with the iphone to your computer regularly as you would with any digital camera.

iOS: Importing personal photos and videos from iOS devices to your computer

I had 946 pictures in photostream. I did a full back up because I was demonstrating to a co-worker what we were going to do to her phone to move her pictures over to her new phone. So I did the Erase all content and settings and then I did a RESTORE from icloud. I chose the most recent back up which was the one from today and only 97 pictures from photostream showed up. The rest are gone. Is there a way to get them back?

do you have a mac with iphoto?

because all photos are stored on your local drive even if you delete them in your photostream...