How to display 4 latest posts with a feature image ?

How to display 4 latest posts with a feature image and other all post on that widget show only post title..

Widget code here

http://pastebin.com/XtQjRqA7

[Nice try – same question – http://wordpress.org/support/topic/how-to-display-3-latest-posts-with-a-feature-image-1?replies=3 ]