Is there a problem? Importing mage field should be no different from any other field, jsut make sure iameg field settings in the target content type match those from the source. But images need to be copied manually.
If you use image field in advanced mode that allows alt to be saved it will produce record in database like the one you posted in first post - record in cvs needs to be in exactly the same format (also field in target content type needs to be set to advanced mode)