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

bitonio

You are using WordPress and <a href="http://www.pixelpost.org/" rel="nofollow ugc">PixelPost</a>. You are probably interrested in showing your latest photos on your blog. pixelpostRSS display thumbnail from your Pixelpost photoblog. Click on the thumbnail and you open the full size photo.

PixelPost RSS

pixelpostRSS displays your PixelPost photos in a widget.

Recent photos widget vs PixelPost RSS