The monument already shows a leak in your game imo. You have to plan a few steps ahead before you decide what you want to build, not just start something and see how it goes. If you had ignored the monument and started stonhenge instead, it already would have been finished by now.
Another point is that you are too late with building a settler. You want to grab a second city quite fast to grab new resources, expand your borders, get a better tech rate etc.
As played, ill finish stonehenge and build warrior, settler, probably worker then (if youre sure that your two warriors are enough to fight early barbs you can switch settler and warrior). After pottery id go BW, buddhism, priesthood, writing, alphabet. Ill start the oracle ASAP and grab CoL or maybe even Civil Service with it. In the meantime ill try to settle about three more cities, with two more to come for a total of six. I prefer to settle in the north cause it seems that the south is a small peninsula where no other civs will fight you for settling there, so it can wait. The horses/rice/banana spot looks nice, although you will have to stick IW somewhere in the tech path to chop those jungles. The cow/wheat seems nice as well, but you need to scout more in that region to be sure.
EDIT: Just saw that you already met Brennus. Is the warrior next to the horses yours or his?
