problem changing header in Pressrow theme

I have uploaded a photo to the images folder on the ftp and changed the stylesheet code where it referred to the photo (3 places), and while it makes the old photo disappear, it does not put up the new photo.

I have searched the support forum as best I can, and general online searches, and not found the answer. Is there somewhere else the photo needs to be uploaded? I uploaded to the site/wp-admin/images folder and it doesn’t seem to be the right place.

Thanks for any help!