Problem with the position of the image

I have a problem with the file position on the page of the item. At the beginning of large photo show on the top of the website item. Now, it displays a thumbnail photo at the bottom of the page. Below description of item in the Dublin Core.
How to fix it?

Sorry for my English. I use Google Translate …

Different themes put the image in different places on the public item show page. Which theme are you using and how do you want it to look? (Big image at top or small image at bottom)?