The Ksav Sofer in the beginning on Parashas Korach might explain the significance of a picture. The 250 people put on a talis completely of techeles and asked if it requires tzitzis. Tzitzis is a reminder whereas techeles is a picture. When one is close to someone, their great love to each other does not require a reminder but a picture. A talis of techeles is a picture something similar like him but not a reminder as in normal wearing. The tzitzis’ purpose is to be a reminder. They wanted to inquire Moshe Rabbenu to ascertain how he sees them being close to Hashem. If they need tzitzis that they are not that close to Hashem. The techeles in the tzitzis satisfies the close ones. So we should be close to gedolim requiring a picture of them as Yosef saw a picture of his father.
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