Yes, what they said. Treat those insets and all borders/edges as a trim with some sort od cleanly stacked brick. Toss some color on this and apply to mythic... right NOW!
I think it looks good, only crit is that under the bridge, where you have the insets the tiled stone pattern doesn't look as good because it breaks up all the time.
Very cool! Agreed with StJoris' point about the insets under the bridge though, you should try one of your other stone textures there, one with a straighter edge, and match that up to the geometry.
Thanks for the feedback everyone! I've taken your comments to heart and adjusted the inset bricks. Did some more normal work, although it may or may not be apparent. Also got caught up with sculpting some objects I probably should have just slapped smooth on and made some extra edge additions/chamfering, etc. Went past…