Nashita

Simple and clean styling widget for displaying latest posts with thumbnail.
After installed the plugin, WP Latest Posts Widget will be in <code>Available Widgets</code> section named <code>Latest Posts</code>.
Optional settings for <code>Title</code> and <code>Number of Posts</code>.

WP Latest Posts Widget

Widget for displaying latest posts with thumbnail

Rafa Poveda

Mecus Consultores

Rocio Valdivia

The plugin gives the option to select the size of the post thumbnail in the feed as:
<ul>
<li>Thumbnail</li>
<li>Medium</li>
<li>Large</li>
<li>Full</li>
</ul>
To change the size of those images, you can do it in Settings -> Media ( http://example.com/wp-admin/options-media.php )

Post Thumbnails in Feed

Adds your post thumbnails to your feed and select the post thumbnail size to show.

WP Latest Posts Widget vs Post Thumbnails in Feed