Apparently Cressida has a completely shaved head tattooed with green vines, but although Dormer was up for getting a full barnet buzz, it was decided that she'd just shave one side - something the actress feels is more in keeping with someone from the Capitol.
“Francis Lawrence, the director of Mockingjay, and I discussed it and I took the job on the premise that I would possibly [have to] shave my whole head. I’m actually really pleased that we went halfway because I think it’s more the Capitol… and that’s where Cressida comes from,” Dormer tells EW.
“She comes from the Capitol, so she’s got a stylized thing going on and now she’s turned rebel. I think it’s right for the character.”