GFork

1. Autoexpand/load and focus the first preview picture.
   
2. Add a line return before the preview so it doesn't stack at the end.
   
3. Add a thin separator line between the thumbnails and preview.
   
4. Click a thumbnail to focus its picture.
5. Make the thumbnails smaller and sort them by ratio.
   

Note: You can edit the code SORT_BY_ASPECT = false if the original image order matters to you. (You may want to disable updates so you dont loose that edit next update.)