Reference: Fataawa Mu’aasirah p424
Fataawa al-’Aqeedah p418
Question: Should the pictures [of humans and creatures] in books be effaced? And does marking [the picture with] a line across the neck suffice in alleviating the prohibition?
Response: I am not of the opinion that these pictures should be effaced, because that would entail great hardship [in doing so], not to mention that these books are intended for educational purposes and not merely the display of pictures.
[Additionally], the placing of a line across the neck [of the humans and animals] does not affect the [ruling of the] picture in any way.
