Good scouting. My first thought was you scouted too far away, but I'm used to normal speed. Also, we're going GW before settler, so we really have lots of time to scout, so scouting out that AI while it is still possible was a good choice. Anyway, with the cow (and ivories) we'll have 6 warriors or so in no time.
Small MM tip (really small

):
I've changed my mind a bit on techpath, I'd go for
Pottery - MINING - masonry - BW
so masonry through mining instead of myst. This way, the worker can help chop out the last part of the GW. Also, we'll have BW earlier (I'd not yet revolt to slavery).
Worker and Worked Tiles Plan:
The worker could improve cow and 1 Ivory before pottery is in, then cottage 2 FP's for food (while working cow+ivory for a few turns to spit out some explorers/fogbusters), then finish up the second Ivory. While building the Great Wall, the worker can cottage up the other FP's and/or road towards the 2nd city and/or chop (the riverside hills) into the GW.
On a side note, I think it's OK to shorten or lengthen the turnset by a few turns to end at a convenient point (tech finished, wonder built, etc)