Gale in District 12, Katniss in the arena, and Peeta on the roof of the training center in the Capitol. I wasn't trying to render any specific scenes in the books, though I had certain quotes in mind when drawing...
"I'm going to stay right here and cause all kinds of trouble."
"She asked me to try really hard to win. I swore I would."
"I don't know how to say it exactly. Only... I want to die as myself. Does that make any sense?"
It was a weird confluence of events that prompted these pieces - got a message about a HG art contest, just read the GameInformer article on the upcoming Tomb Raider reboot/origin, and had a digital painting of a forest background chilling on my hard drive, etc.