File:Endocrine.jpg

Appears to be a modification of https://www.gettyimages.co.uk/detail/illustration/endocrine-system-set-icons-royalty-free-illustration/517645761 without the getty images credit or brain

Website states it's royalty free (meaning pay once for website access only) plus "RESTRICTED ASSET Sorry, we are not able to license media #517645761 due to country, company and/or publication restrictions."

Highly likely to be a copyright violation