Resolutions for the Large Portrait are 210 x 330, and the small portraits are 76 x 96. The portraits for the characters are in
pillars of eternity/pillarsofeternity_data/data/art/gui/portraits/player and then male or female (doesn't matter, just easier to find your picture that way).
Put your large and small portrait pictures into either folder, but make sure they're png's, call them the same title like "human_female_example01" and the large one ends with "_lg.png" and the small one "_sm.png" so the game will associate them with one another.
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pillars of eternity/pillarsofeternity_data/data/art/gui/portraits/player and then male or female (doesn't matter, just easier to find your picture that way).
Put your large and small portrait pictures into either folder, but make sure they're png's, call them the same title like "human_female_example01" and the large one ends with "_lg.png" and the small one "_sm.png" so the game will associate them with one another.