Google now appear to be only showing an Author image once per page in the Google results.
Up until recently if you had 2 pages appear on the same page in the SERPs your Google Author image would appear alongside both of them.
If you had other sites which you were the author of on the same page it wasn’t uncommon to see your Author image 4 or more times.
This appears to have changed now and only the highest listing shows your Author image with all subsequent listings just showing by “name” under the title.
Interestingly, it is once per displayed Google Page.
If you have Google set to display 10 results your author image can display on pages 1, 2, 3, 4, etc.
If you have Google set to display 100 results your author image only appears once in the top 100, once between 100 and 200, once between 200 and 300, etc.
Interestingly if another page is using microdata and has review stars displayed in the SERPs the author image still shows but is smaller and displayed under the description.