Clockwise from top left:

• DH, chapter 19 (perhaps not the best example, as Ron did not seem fond of camping…)
• DH, chapter 32 (“And that’s the second time we’ve saved your life tonight, you two-faced bastard!”)
• PoA, chapter 6 (Hippogriff CoMC lesson in the forest)
• Unspecific, but probably post-Lavender.