Yeah, that was a few years ago now... I just checked on the interview and I see who you mean. That is Erica Campbell, a 'muse' for Babs. A more recent one would be Sammy Braddy, but both have qualities I imagine in Babs. The by-far closest match to Nina is Lucy Collett. As for Lucy (my character), I've never settled on one muse, but she is perhaps most influenced by certain women of the 70s and 80's that you don't really get, such as a younger Olivia Newton John (the singing) and even Helen Slater in Supergirl (lookswise) with a bit of the classic fifties blondes, and to be more modern, a slight hint of Gemma Atkinson, although she and Slater are facially quite similar anyway, and I think this is how Lucy and Babs might look - I've always thought both looked quite 'Foxy'.
While checking that interview, I see that I have given Barbara a date of birth. She'd be 25 this year, officially after the story is set to finish.