Yeah, the barb camp is the one west of Shanghai next to the mountain and the river. That would've been good placement. Mountain for the observatory, river for the river stuff (garden, water mill). Plus you get more grassland (more food) and less desert, which gives you virtually nothing. You already have one desert city, your capital. That one is ok, because there is an incense, a desert hill (which gives you production) and an oasis, which provides fresh water for irrigation purposes. With Petra built, those desert tiles can be pretty productive. The desert tiles Shanghai gets are all flat desert, which give you nothing whatsoever. That's dead space, and since you can only build one Petra, that's a terrible location. This is why Shanghai isn't growing. Also, if you put one worker working grand mesa, that's one guy who's not producing any food. For a city with low population supporting one worker who produces no food is a heavy burden. You want to avoid working the grand mesa until your city at least has a good population so that it can continue to grow even if someone is not making any food.
I suspect if you scout a little more, you can probably settle another city south of grand mesa, which will still give you the benefit of the NW and also more productive tiles. I see there are some mountains there, but are there grassland or other things?
I think priorities for settling are as follows: good sources of food, at least one unique luxury (that you don't already have), hopefully good hammer source, defensibility, not necessarily in that order - you might need a production heavy city, or a city to hold off a choke point, so priorities change depending on the map. Neither Barrington crater or grand mesa are particularly attractive - they're nice, but not worth sacrificing a lot to get, IMO, unless you're Spain, which you're not.
