stigcq

A plugin offering a widget showing recent photos in posts. It can be configured 
as for how many photos to show, the title on the widget and max width and height for 
thumbnails.
The thumbnails links to the post where the photo is showing. They show a mouse over 
effect with bigger version of the photo in a tooptip.
It has option to exclude photos from the view.
It has only been tested with WP 4.2, it might work with lower versions.

Recent photos widget

A simple widget which shows thumbnails of latest photos in posts

Thad Allender

PhotoShelter

The <a href="http://graphpaperpress.com/plugins/photoshelter-gallery-widget/" rel="nofollow ugc">PhotoShelter Gallery Widget</a> is a plugin for WordPress that allows photographers to easily display the latest photo or photos from any number of their public PhotoShelter galleries. This plugin doesn’t show galleries in collections. PhotoShelter is web application used by photographers around the world use to sell and license images.
<h3>Documentation</h3>
Full documentation can be found on the <a href="http://graphpaperpress.com/plugins/photoshelter-gallery-widget/" rel="nofollow ugc">PhotoShelter Gallery</a> page.

PhotoShelter Gallery Widget

PhotoShelter Gallery Widget allows you to show your PhotoShelter galleries into your sidebar.

Recent photos widget vs PhotoShelter Gallery Widget