On Treasure Planet, Harald Siepermann also worked for several weeks on visual development for the character Captain Amelia.
Amelia is the captain of the magnificent space galleon the Starfinder, that takes Jim and Professor Doppler on the expedition to find Flint’s treasure. In the script she is described as a clear leader, educated, well trained, highly experienced and extremely competent. She’s competitive, projects overconfidence, and can seem a little arrogant, though underneath this there is some vulnerability. Physically she is described as tall, imposing and beautiful. And she is cat-like and moves gracefully.
Below are some of Harald’s early designs of Captain Amelia, the alien creature with cat-like features: