This is what ChatGPT gave me based on these revised prompts:
Prompt
A great white shark surfing like a professional surfer on a surfboard, riding a big ocean wave, wearing stylish sunglasses with clearly visible side arms resting above its eyes, shark body with realistic muscular human-like legs replacing both lower side fins, both legs bent in a natural surfing stance firmly planted on the surfboard, wide toothy grin, cinematic ocean spray, vibrant summer lighting, ultra-realistic, detailed textures, action shot, dynamic angle
Negative Prompt
dog face, mammal mouth, cartoon, missing sunglasses arms, distorted sunglasses, melted glasses, blurry, low detail, deformed head, incorrect shark anatomy (except for the human-like legs), dolphin, one leg only, asymmetrical limbs, leg off the surfboard