32 images in training data is very anemic for a style in Illustrious. Since this was a cartoon with multiple episodes, you shouldn't have difficulty hitting a 100+ images. I can't say for certain how many you do need, only that it's at least 100 and likely under 200, wants variety in characters (even random incidental background characters are fine), and "no humans" shots of animals and scenery are both useable.

Awesome style!