See image below. Words always work (I also rearranged your metadata into something that seemed more readable - and aligned with the delete icon).
Checkmark placement is fine.
To "offset" the border a little, and make it more perceptible to the eye, you could add a small inner border of white or the background grey (see image). You'll never find ...
It's a good thought and function of showing meta data on hover when you are dealing with photos.
My observations on understaing the flow of your requirement,
Since meta data is shown on hover, there is no need of close icon to close the meta data display, user has to just take a cursor away.
taking into account of displaying the select feature and showing ...