A few never-before-seen illustrations by J.K. Rowling from the
Harry Potter series were released through various Pottermore stories and content written by the author.
They include a look at
Peeves annoying Percy Weasley as he brought the first years - such as Harry, Ron and Hermione - to their dorms; Snape lurking about in his
Potions classroom with irritated Harry and Ron looking over; and the breakdown of
Quidditch by players and balls. Those can be seen here.
The author has been releasing personalized illustrations from the series for decades now, many of which can be
found here.
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J.K. Rowling's newly-revealed illustrations feature Snape, Peeves & Quidditch scenes 
