Veiws return file id instead url of image.

Actually Term Fields module does not provide URL field for Views. This is done by the Views module itself, which handles the {files} table and related handlers.

Term Fields module only provides a field and a relationship handler that relies on file fid. In order to get the URL of your file, you need first to create a relationship on the term field you created, then you have to add the URL field that is in the "File" Group.

Hope this will help you. If not, please attach to the issue a file containing an export of your view, or explain clearly how you do to retrieve your information.