ArcVieh

You can select images from media Library in the Widgets backend that will be shown on your Page. You can enter a size for the images.
The thumb-images will be linked to the full-sized-image. 
Requieres PHP 5!

Media Images Widget

Requieres PHP 5! You can select images from media Library in the Widgets backend that will be shown on your Page.

Green Sheep

This plugin performs image recognition when uploading images. It uses Google TensorFlow.js for image recognition.
Image recognition starts when images are uploaded from WordPress Media Library. Recognition results are automatically registered as captions of images.
Notes
<ul>
<li>Image recognition results are only in English and Japanese.</li>
<li>When uploading files with the Browser Uploader, image recognition does not work.</li>
<li>WP Image Recognizer works with Chrome, Firefox, and iOS Safari, but not IE.</li>
</ul>
<h3>Arbitrary section</h3>

WP Image Recognizer

WP Image Recognizer performs image recognition when uploading images.

Media Images Widget vs WP Image Recognizer