I believe in this picture the coronal suture is the vertical one and the sagittal suture is the horizontal one. My first thought upon seeing these sutures was that anything with their labyrinthine complexity can't possibly be reproducible and so their patterns must be specific to each individual deer, like the finger print patterns of humans.
Here is the sutures around the bregma of deer skull #2:
Deer skull #3:
Deer skull #4:
The patterns do change from skull to skull, at least in these 4 examples.
As soon as I figure out a technique of divination based on the reading of the deer skull suture, I will reveal it here for all in the future.