I am all for illustrated children's books, and I do understand the concept of artistic liberty, but the point of illustration is to depict reality. In the past couple weeks, here are two illustrations that jumped out at me as being drawn from fancy, without checking for accuracy.
From kids' siddur, Shabbos table
From Parsha book, sighting of the new moon
Can you tell what's wrong with these pictures?
Sadly, I think I will have more to add to this category...