I would love to have access to those source photos
Not bad this time around, my crits:
First: There is a dark and light repeating anomaly.
Second: This one tiles awkward, the spaces are large in some areas and the stones get smaller at the top. Also the shadows are bad, try taking reference shots in overcast.
Third: There is an obvious anomaly, and also the textures are different in ever quarter since the lighting doesn't match.