Google Webmaster Central blog has introduced a new FAQ, which is designed to provide answers to Google authorship queries.
Here's what the blog consists of:
What Qualifies for Authorship?
What is the criterion for pages to have the authorship applied to them?
The criteria include the pages which are being mostly authored by the designed authors. These carry a byline and should be single articles. The compilation page of articles by authors does not fall into the criteria.
Mascots not Allowed
Google doesn't prefer a mascot as an author in the search results, instead it wants a human to be featured there.
One Google+ Profile
Google says not to having multiple Google+ profiles in different languages.
Authorship can be Blocked
Authorship can sometimes appear even if you have not set it up. Google says that you can block your profile from being used for authorship.
Only One Author
Google authorship doesn't support more than one author.
You can get more information on the guide to authorship on the Google's blog post.Google Provides More Info about Authorship in the Webmaster Central Blog!,