The image you used for your cover shot is not in the public domain, did you get permission from 'huffingtonpost' to use it? Sourcing it is all good and well, but that's not technically enough.
https://www.huffingtonpost.co.uk/p/huffingtonpostcouk-terms-of-service
- Your Use of Our Content is Restricted:
(a) Unless expressly permitted, you may not copy, reproduce, distribute, publish, display, perform, modify, create derivative works from, transmit or in any way exploit any part of our site or any content on our site, except as permitted under the last sentence of this Section 4(a) or to make one print copy that is limited to occasional articles of personal interest only.
as long as its not in an artistic tag or the main content being presented its fine. You can check with GP if you want. Have a wonderful day.