Additionally, it's actually a public domain image.
https://etc.usf.edu/clipart/50600/50687/50687_heart.htm
Source:
Steele, Joel Dorman Hygienic Physiology (New York, NY: A. S. Barnes & Company, 1888)
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Additionally, it's actually a public domain image.
https://etc.usf.edu/clipart/50600/50687/50687_heart.htm
Source:
Steele, Joel Dorman Hygienic Physiology (New York, NY: A. S. Barnes & Company, 1888)
That doesnt change anything. still needs to be cited, plagiarism isnt about the use rights of the image, is about lack of attribution, no matter what the status of the image.
Its the same as if you quote or copy a part of a book that is in the public domain, you still need to give attribution.