In the later stages of Spec-Driven Design, designers first define a visual direction through moodboards and written style guides, then use AI agents to apply those styles to working prototypes, and finally refine the results until they match the original vision. The process emphasizes maintaining designer control: AI accelerates implementation, but human judgment remains responsible for selecting references, defining aesthetics, and ensuring quality. Refinement can happen through prompting AI, editing designs in Figma with code-linked workflows, or directly modifying code, with the goal of achieving a polished, pixel-perfect product rather than accepting AI-generated approximations.