As well as the way it has been presented of comparing the Shroud of Turin to the original image of Divine Mercy. There use to be a website that had it superimposed so you could see it right on top, I can’t find it now.
This webpage does have it at the bottom of the article: http://www.faustina-message.com/zgromadzenie_anga.htm
I think some of us too are vaguely or well familiar with the Shrouds influence on early icons.
Back to the Divine Mercy, the original illustration is the important one here and if there is such a thing as Divine Inspiration, that may be a part of it.
I wish the website http://www.faustina-message.com/zgromadzenie_anga.htm had the whole image but it is only the head. Perhaps someone knows where it might be elsewhere on the internet.