Theming image gallery created with new Views support included with Image Module 5.x_2.x_dev

Does anyone keeping up with the Image Module dev versions know how to theme an image gallery supported by its new Views integration?

I downloaded the Image Module version 5.x_2.x_dev discussed in this handbook page http://drupal.org/node/207216 to my test site, in order to investigate the Views support now included in the dev module. I like this integration, it solves for many previous limitations to Image, and while I'm still experimenting with Views, I do hope to add it to my live site.

The one issue I'm having with this integration is theme/css related. On my live site, (running Image Module 5.x_1.6), I made some slight tweaks to image_gallery.css - but when I copy this file to my test site, it doesn't affect the look of the new galleries, which aren't too pretty to begin with. I'm sure this has to do with the views integration, but am not skilled enough to figure out just where to switch my focus.

Any advice would be great, thanks!