As always, good job ;)

However, I found bugs with every photo pulled either to left or right:

It happens on busy.org, which is a really cool interface and I use it on daily basis. I think you simply shouldn't use Markdown inside HTML tags, so instead of:

<div class="pull-right">
    ![](link-to-photo)
 </div>

use:

<div class="pull-right">
    <img src="link-to-photo">
</div>