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

pmkelly

This easy-to-use widget for WordPress will display the most recent public images from your SmugMug account. All images are displayed using the same width, and linked to its original SmugMug display/purchase page. Widget configuration is simple, and does not require any special authorization steps.

SmugMug Widget

A simple widget for displaying the most recent public images from a SmugMug account.

Recent photos widget vs SmugMug Widget