See people who liked the photo

The first bit of information should be readily available in the Notifications centre. Click/tap on the Notifications icon (looks like a bell) top right of the app window and you should see a time-stamped list of comments/likes that have been made on your shared images. The name of the people making the comments is shown, together with a thumbnail of the relevant images.

However, there's no metrics data available to show "how many likes photos get", you can only see that information by looking at the Activity page on an individual image.