<amp-img src="https://placeimg.com/640/480/any" alt="Image description here" width="640" height="480"></amp-img>
If you are creating your webpage using AMP then you can not add an image using the <img> tag. This will not validate the AMP page and if you are using <img> HTML element to render an image on the webpage.
To render an image on the AMP webpage you can use the <amp-img> tag and provide the URL of the image in the src property. The AMP will take care of lazy loading and fast rendering of the image on the webpage.