Let it Stay
I think this is great, you have all the elements of a great piece here, the background of snow, the foreground of snowflakes, the character Elsa, the blues, the magical effect drawing, the dress, the hair. It is all spot-on and great. I think you did a good job with your brush strokes and detail in each element. I love the magical snow around her hand, but maybe next time try some glow effects here or maybe some lighting effects in photoshop to really bring this alive. I love is as it is though.
~~THINGS TO IMPROVE ON~~
Add some effects to your magical elements or lighting effects.
~X~