I may be over thinking this portrait but to me there is so much symbolism:
-Katniss not sitting in the chair, because she doesn’t abide by the Capitols rules
-She is the only one so far looking directly at us, to show that she isn’t intimidated by the Capitol, but the others were.
-She’s holding the white rose down to show her feelings of superiority over it, with President Snow being the rose.
-Unlike the others, Katniss has a simple and plain chair. It’s because Katniss was a simple girl from The Seam who became the symbol of the rebellion.
I actually have to correct you on that last one. The simple chair represents the capitol belittling the victors. Although they fought for their lives and won, they still think of the victors like they are not worthy. They’re like, ‘hey you might have won, but you are still lower than us.’
well we haven’t seen the other victors pictures yet so I’m just going by this picture only and her chair
They posted a teaser of the next portrait (we’re assuming is Beetee) and he has the same chair.