Going through my files I just found this drawing again, my first attempt at drawing out the Beit Kama mosaic (Israel). There is still the outer section to do.
The problem though is the age old one of having to go from photos that are usually taken from the ground so you see the mosaic at an angle. It's not only the pattern itself that you need to see but also the proportion. The difference in size of certain elements in a geometric pattern can be very important to how the mosaic is set out.