get_post_gallery_images only returns a singular array of image URLs, so $image->post_title etc won’t work, hence your error message.
The approach generally is off – you’ve followed the codex for get_post_gallery_images but that snippet is aimed at re-using the image urls within the post, but outside the gallery output.
get_attached_media is more suited here (just a more concise helper than writing $args out for a get-posts call).
http://codex.wordpress.org/Function_Reference/get_attached_media
If this is a modification to all your galleries then the answer below will show you a much better and more flexible approach (using the post_gallery filter instead).
https://stackoverflow.com/questions/19802157/change-wordpress-default-gallery-output
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