I would change the location of your city to the left to secure iron and/or gems, or to the sugar/tobacco in the bottom right. If you can remove all the jungle around the gems, there is good land for population growth and production, good opportunities to get commerce, and you secure a strategic resource and a luxury resource. Also consider the wheat/ivory place to the north (but I think in the end I would go with the river/gold combination as in the picture, because gold is better than wheat for your purposes, and your culture will eventually encompass the ivory if you try - but that would be too late to get the State of Zeus).