Trouble with images

I am having some trouble with adding another image under my product photo. Even though i’ve tried different sizes of images, the thumbnail still becomes blurry and the sides are cut off. It is also not aligned with the bigger photo.
The idea with the picture is that i want it as a quote from the owner of the webshop. – Any other ideas how to do this is more than welcome 🙂

(the website is not online at the moment so i cannot link to it)

link to picture : http://i57.tinypic.com/15wfnmw.png