I decided that I would go the simpler route and duplicate my characters using after effects and green screen. The decision was also made because the animation that I'd done so far wasn't perfect and I felt that it would be easier to composite footage together with some effects and make the overall project more interesting. I have used my first model to create two other girls and I have adjusted their costume, lip and eye colour to make them different. I'm quite happy with the results and now that I have done this I can render out all my footage with a green screen background and use After Effects to removed it.
I think the best way to remove the background would be to use colour keying. I have done this before, however, I thought it important to source a few pointers from the internet for doing this in a more accurate way and I think the results that I have produced work quite well. It's obviously getting very close to the dead line for this piece and therefore I need to use this week to edit and composite my footage. I'm also going to have to get a hard drive to transport all my footage because the files are too big to fit on a USB stick as I need to use a more powerful computer to render out the After effects project in university. I tend to find that my computer doesn't give a very good finish to projects when produced with After Effects, maybe it's too memory intensive.