Built out capital and grabbed GLH, Oracle (for MC), and a Forge. Missed ToA, someone else completed before I even got it started. Now working on Library while copper is brought online to save

on Colossus.
Second city 1N of Cows, grabbed the gold to help with economy, has allowed me to run 80% + the whole game thus far. This city will be hard pressed to get large, as its definitely food poor. Also, I never know exactly how to improve terrain like that around this city. Plains tiles on rivers scream watermill to me, especially since its a food poor territory; do I just wait it out in this city until I can build them, accepting its small pop and low yield until later in the game?
Third city grabbed closest copper. Could have gone for the inland copper and a nicer city, but this spot seemed closer. Now that I look back on it, I wonder why I didn't go for the inland copper. Mistake?
Current plan is to get the copper online, bang out the Colossus, and work on expansion. Somewhere amidst the REX, pop out the GL/NE.
Diplomacy wise, we have Pacal down there in the corner chugging away, so I'm not entirely isolated. I'm sure with more coastline exploration I'll be meeting other civs.
I've dotmapped the land the best I can. Please offer critiques, as I feel this is one of the weak points in my game. I'm stumped about what to do with the NE portion of the island, as it is SO food poor, same with the Northlands and NW of the capital. Any advice is definitely welcome.

The real reason I stopped playing was due to my first GP, a merchant, nice. It was a toss up between a merchant and a prophet, so I was a bit worried I'd be stuck settling a prophet. But how do I use this wonderful merchant? I could settle him for the game-long +6 to gold and +1 to food, something that's quite appealing given the low food availability for both of my newest cities. I could also use him to light bulb Code of Laws right now, giving me courthouses faster to make the upcoming REX less painful with my oddly placed capital, and letting me run Caste System and go nuts with my GPF. The problem with CS now is I would miss out on the benefits of Slavery for the upcoming REX and much needed military buildup. Heres a look at the current tech situation.
So what are your thoughts? Do I settle him or light bulb?