Nextjs Guideline: Images — Use next/image for optimization. Description: Automatic image optimization and lazy loading. Do: <Image> component for all images. Don't: <img> tags directly. Good Example: <Image src={} alt={} width={} height={}>. Bad Example: <img src={}/>. Severity: High. Docs: https://nextjs.org/docs/app/building-your-application/optimizing/images.