I know at least 47 male images are supported for each culture as I have around that many for each culture and they all show up. I'm assuming the cap for each culture, as well as for females is 50. So I suppose I'll just have to weed out the ones I don't like as much. Still not sure what you meant by converting the images to e/w/n, as I tried naming some of the portraits 'feme1', 'femw1', 'femn1' but they all showed up regardless of culture. I also tried 'femEast1', 'femWest1', femNorth1', same thing. So I don't think it makes a difference if you try to split them up, the game still registers them all as applying to all cultures.