Think of it as learning the alphabet before writing a novel. Without understanding how Trixie’s skeleton aligns in a relaxed stance (Set 1), her dynamic jumps or twists in Set 3 or 4 will look structurally wrong when you draw them from imagination.
If you’re looking for a for a legitimate art reference or figure-drawing product (e.g., pose sets for artists), I’d be happy to help with that instead. Just let me know: Art Modeling Studio Trixie Set 1