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This is a link in markdown code:
[link-text](https://some.site/your-link.html)

This is an image in markdown code:

![image-text](https://some.site/your-image.jpg)

Now all you have to do is combine this, by replacing the link-text with the markdown image code, like so:

[![image-text](https://some.site/your-image.jpg)](https://some.site/your-link.html)

If you host your images on https://www.steemimg.com/ they'll provide the markdown code for that automatically.

You, sir, have been extremely useful. Thank you!

@Herzmeister Thanks you very Much 🤣