Here’s how you make links in general.
[text goes here](https://site.tld/stuff/image.png)

Add an exclamation mark if you want to turn the link into a picture.
![This makes the picture visible without clicking it.](https://upload.wikimedia.org/wikipedia/commons/thumb/0/04/Cone-fundamentals-with-srgb-spectrum.svg/960px-Cone-fundamentals-with-srgb-spectrum.svg.png)

Here’s how that looks like in practice.