I think if you're having to paint a picture to get a match then it's pretty much just an ink blot at that point - everything else had proper image references that were able to be tracked down in less than a day as a perfect match.
As for what it actually is, it has to be between Kongo and Poland, right? So as far as civs that have been represented in Civ before, that includes Korea, Mali, Maya, Mongolia, Morocco, Native American, the Ottomans, and Persia. I think we can safely rule out the Native Americans as a blob civ again, which leaves us with seven options if it's a returning civ. Of course, it could be a new one - Mutapa and Mapungubwe would fit in place of Zimbabwe, though I would imagine Firaxis would want the name recognition of the latter. There's also a whole host of M civs - the Maori, Mapuche, Makuria, the Minoans, the Mughals, Maratha, Maurya, Macedon, Moors, and so on. Then there's stuff like Nubia, Novgorod, Norway, Normandy, Oman, the Papal States, Phoenicia, Papuans, Majapahit, Paraguay. My point is, we're at a point where there are too many options to simply go based on alphabetical order, so we need to look at other ways to go about it. They've talked of TSL a hell of a lot, maybe it's the Majapahit as a SE Asian civ, or the Pagan Empire? Ottomans or Persia are a high likelyhood as well, but we'd need to try and find an actual image instead of painting one to look like it.