As a follow up to T257938.
(1) Other in Images tab fetches files with Creative Commons Attribution-Share Alike 3.0
Checking commons wmf.26 I observed exactly what @AnneT pointed out in the above comment - Other option returns images with Creative Commons Attribution-Share Alike 3.0, e.g.
https://commons.wikimedia.org/wiki/Special:MediaSearch?type=bitmap&q=rose&license=other will display in the result set the following image:
The issues below are minor issues regarding displaying copyright info in QuickView.
(2) No attribution is shown for files that do have licensing information.
The following file has Licensing attribution but it's not shown in QuickView.
(3) Some files have license that seems to be 'No restrictions' instead of 'Other'?
e.g. https://commons.wikimedia.org/wiki/File:Sarajevo_Cathedral_Rose_Window.jpg but the image will be returned with the Other option.
(4) The licensing information is shown without the copyright icon/label which might make it difficult for users to see that the licensing info is present: