It is likely your images are linked with the old domain from within the style, search for the old domain in your your styles and remove it leaving only paths to images
Code:
images/blah/someimg.png
rather than
Code:
http://olddomain.com/images/blah/someimg.png
Also check in style manager, the images there may also be linked with the old domain do the same as above simply remove the old domain leaving only paths.