Bulbasaur and Memoira (top left) are the only ones true to the actual color of the scanned image, and even then their colors are a bit duller than the source; Puellan ran into the unfixable Red and Neon Problems, while Yurian (bottom left) and Ramza have issues with both contrast and weirdly muddy yellows/overly red oranges that I'm not good enough at image editing to repair. The sort of thing that's kind of unavoidable, in my experience.