I want to add a blankline (or add more whitespace) between heading and the image using ReStructuredText:
====
John
====
.. image:: _static/john.JPG
:alt: John
:height: 300px
:width: 400px
But I don't know how to do it?
Use the pipe vertical line key as shown below
====
John
====
|
.. image:: _static/john.JPG
:alt: John
:height: 300px
:width: 400px
That should work.