fitztrev

Comment Image Embedder is a very simple plugin that, once installed, lets your visitors add an image to their comments.
It’s rather common for a WordPress user to ask how visitors can embed images in the comments section of their blogs.
This plugin will add a link just below the comment box that a user can click on. When clicked, a prompt will appear for the user to enter the URL of the image. It will then be added to their comment.
Trevor Fitzgerald 
http://trevorfitzgerald.com/

Comment-Images

Comment Image Embedder is a very simple plugin that, once installed, lets your visitors add an image to their comments.

WPman

The plugin Slider comparison image before and after allows you to create the effect of comparing the two images before and after.
You can use the model vertically and horizontally. Used via shortcode [sciba].

Slider comparison image before and after

Slider comparison image before and after for your website to WordPress.

Comment-Images vs Slider comparison image before and after