The challenge (aka "Hello Kitty"):
Upload a specified zip file as a static resource. The zip will have directories with images and you have to display a specific image on a Visualforce page.The page must be named 'ShowImage'.
This file must be uploaded as a Static Resource named 'vfimagetest'.
The page must have a Visualforce apex:image tag that displays the 'kitten1.jpg' image from the 'cats' directory of the static resource.

I have uploaded vfimagetest and made it public. I unzipped the file (maybe my first mistake) and can see the kitten1.jpg file. My code is:
<apex:page>
  <apex:image url="{!URLFOR($Resource.vfimagetest,'images/kitten1.jpg')}" width="50" height="50"/>
  </apex:page> 
The code saves; however, I cannot see the file. I know that I am missing something simple. If someone can assist, I can start my self flogging in earnest. Thanks.