"He could be my brother. Straight black hair, olive skin, we even have the same grey eyes" (page 8)
Although technically this quote is describing Gale, it compares his features with those of Katniss', and how much alike they are. Therefore Katniss, just as Gale, has " straight black hair, olive skin, and grey eyes".
"'She's excellent,' says Peeta[.]" (page 89)
"Don't underrate yourself'," (page 89)
These quotes shows that Katniss often diminishes her abilities, and just how good she is at doing what she does. It also shows how much admiration Peeta has for Katniss.