Final answer:
Hermione is not included in Luna Lovegood's painting of her Hogwarts friends, which features Harry Potter, Ginny Weasley, and Neville Longbottom.
Step-by-step explanation:
In Luna Lovegood's bedroom, the painting of her friends at Hogwarts does not include Hermione. The painting features those she considers her closest friends including Harry Potter, Ginny Weasley, and Neville Longbottom. Despite Hermione being a significant character and a member of the main trio in the series, she is not depicted in this particular artwork Luna has created.