Field_image empty after database export and import
I am assuming that the Images are showing as uploaded in the backend. But when trying to view it on the front it is coming broken. you can check the file system path in the drupal admin it should be sites/default/files

if the file path is not the issue, then look at here(https://www.drupal.org/node/920840) there was a thread going around the warning and seems to be resolved. #22 could be the solution to look.