i love how you put your own style on this! i actually drew a picture of the tooth fairy that you can check out if you want! its not digital though but oh well! dont stop drawing pictures of jack frost, EVER
But what if you drew Jack Frost and Shiro? I don't ship them as quite the romantic pair. I'd rather see them as the Long-Lost Siblings Pair due to the same white hair, but with different eye colors. All the fangirls seem to enjoy the flawlessness of Jack Frost and Shiro's unhealthy eating habits.
Every character has flaws. Jack is a reckless rebel, whereas Shiro is a mindless killer deep down. I already imagined a crossover between Mr. Frost and one of my OC's, but your idea can be yet another side-project.