No, you can't do what you want. That requires a script to run to pop out the image. And you cannot embed scripts in you posts.
You can create a link to the larger picture. So, if someone clicks on it, they will go to a page, that is the larger picture.
< A href="www.mypicture.com/picture.jpg">
< img src="www.mypicture.com/picture.jpg" />
< /A>
In steemit com the picture gets sized to 672 px wide.
If they click on the picture, they will go to mypicture com and view the full picture size.
Thanks for the clarification man, it was super useful