"Create a high-quality, extremely detailed digital artwork in a vibrant, graffiti-inspired style. The scene features a cartoon caveman riding a T-Rex in the Stone Age. The caveman is depicted with a humorous, exaggerated expression, holding onto the T-Rex's head with one hand and brandishing a club with the other. The T-Rex is in mid-stride, with dynamic movement and muscle detail. The background is a prehistoric landscape with clean, graffiti-style elements, including bold, colorful rocks, lush greenery, and a bright, sunny sky. The overall composition is lively and energetic, with a rich palette of colors and bold, clean lines that capture the playful and adventurous spirit of the scene."