<p> <img src="lotus.jpg" /> </p>
By default, images don't have any borders:

But if you want they can be framed:

<p> <img class="image-with-border" src="lotus.jpg" /> </p>
Or they can have shadow:

<p> <img class="image-with-shadow" src="lotus.jpg" /> </p>
Or they can even have overlay:

<p class="image-overlay"> <img src="lotus.jpg" /> </p>
Border-radius

Image Lightbox
It's possible to open a larger version of the image in the lightbox:
<p> <a class="image-with-lightbox" href="lotus.jpg"> <img src="lotus.jpg" width="400" /> </a> </p>