Hey @smartsovereign,
The plugin automatically crops the image to 1200×900 if it is larger than that, which should be the ideal aspect ratio for GBP posts on the search page. Unfortunately it seems Google handles programmatically uploaded images differently than ones uploaded through their own interface, causing small black bars next to the image when you open the “View older posts” dialog. The plugin goes through quite some hoops to make sure the post image falls within Google’s image requirements and recommendations, and there is currently no way to turn any of that off. But I’ll do some tests to make sure the 1200×900 is still the ideal size. What issue are you having with the post images?
I’m not entirely sure what you mean by your second question… You want to get the URL of the post image on Google? Theoretically it is returned by their API when creating the GBP post, but the plugin currently does not store it.
I noticed there is currently no programmatic hook in the plugin that would allow you to get the data of the created post on Google (such as the post image URL). I reckon that might be useful and will add that in a future update.
~ Koen