what @randomwanderings said but note you will have to remove the markdown that Steemit automatically inserts around the image URL when you do this. See below for example.

This will not work (or rather, it will have some funny symbols around the image and the image descriptor as follows):

So here is what the above code would look like - note the funny symbols around the image:

What you want to do is remove all the markdown from around the image URL inside the DIV tags as follows: