It's never good when a famous painting gets damaged! There are different types of damage that can affect paintings, some of them accidental, some intentional – such as the vandalism which affected The Rokeby Venus in 1914.
A lot of the work done here at National Gallery is actually repairing the damage to paintings. There is a painting that was very difficult for the gallery to fix!

Choosing a new school: what was your first day really like?
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Choosing a new school: what’s the best thing about your school?
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Choosing a new school: the questions to ask on a school tour
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