Hi Primaler. Regarding your edits like this , the parent category has never bothered with the last name sort (for numerous reasons). As the parent category contains over 4500 of these artist categories, unless you plan to add the sort to them all, I think these edits will only introduce confusion and inconsistency (for me, I do look at Category:Google Art Project works by artist quite often, and expect to see it in simple alphabetical order after the "Google Art Project works by " part).
|File:Jacop Epstein Rockdrill study.jpg has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.
If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue.