This was for a request! Another extremely talented creator on this platform that I follow (and think you should follow, too), LittleJelly, did a version of the character. I think their version looks great! However, based on their preview images, I feel like mine adheres a bit closer to the manwha's art style. If you want to make images of Rossweisse in the style of the official manwha, this model comes recommended!
Recommended keywords: silver hair, very long hair, dress with golden trim, navel visible through clothes, dragon tail, white thighhighs, large breasts