puggan

You just uploaded a few images to you blog, and notice that the thumbnails cut off the heads of them, 
here is a tool to specify exactly how you want your thumbnails cut, you can zoom in and drag the thumnail 
area to the position that you want. 
This tool is even more useful in combination with theams and plugins that use of thumbnails.

Reposition Thumnails

A pluggin for the moments when the center of the picture wasn't that good as thumnail, so you can avoid cut of heads in yout thumbnails.

ThemesVila

This plugin made with flexslider. Supported all crosebrowser and Responsive. very nice and helpful slider plugin

Reposition Thumnails vs BH Basic Slider