Images in markdown are the same as links except for the bang (
!) character preceding the syntax.
The syntax for links is squares-parens. I have a hard time remembering this, and I try parens-squares as often as not, but its squares-parens, like this:
The syntax for images is also squares-parens but preceded by a bang (
!), like this:
![My alt text](https://mylink.com/oh_my.png)