"It didn't really worry me too much at the time, but it was weird."
Kristina has since signed nearly all of her artwork.
She has no idea how she managed to amass such a following.
"From the 10,000 in one day - I was shocked. Then I think a lot more followers are my age and and I think they like the fact I draw one of them once a week."
Through an app called Drawmekristina, fans submit photos of themselves they would like her to draw, and once a week she will surprise fans with the picture she has drawn.
"I kind of see it as a way of giving back for being supportive. It's always a surprise."
Kristina plans to focus on her artwork for the first half of this year before beginning studies at Waikato Institute of Technology later this year.
Meanwhile, Hawke's Bay 16-year-old Jamie Curry has become one of the most famous teenagers in New Zealand with a global following of more than 7 million people.
Jamie began a Facebook page titled Jamie's World last year and received more than 500,000 "likes" and 60,000 subscribers to her YouTube account where she posts funny and awkward videos about her life.
Kristina and her drawings can be seen at www.instagram.com/colour-me-creative.