As part of the push for Google+ is the growing personalisation of search results. Getting your headshot shown personalises search result pages and will lead to a high click rate.
To get author tags to be shown in wordpress the easiest plugin is WordPress Plugin – Google Plus Author Information in Search Result (GPAISR).
You will also need your google+ profile which is inserted at the bottom of your user profile in wordpress – https://plus.google.com/u/0/104752421194455471064
And then simply follow instructions on Google.
