Every particularly interesting ~major revision~ of Katja (1.0, 1.5, 2.3, 3.1, and 4.1), Eva, one of my Warriors RP forum characters from almost twenty years ago, and a bit of a proto-fursona I had before actually committing to being a furry, all in their original ref sheet colours (or as close as I could get in the absence of actual ref sheets)!
…this is all basically "in character", by the way, if you assume each character lines up with who I was at the time.
Also, clockwise from the top left:
