The sketch is actually my favourite, too.
I love the way you draw the muzzles, it resembles both G4 and G3 styles but with your personal touch showing through. I guess in the sketch the style is particularly defined, that's probably one of the reasons I like it so much. I love the candy cane curls, too!
I also really like the different poses you draw and the shiny looking hair in the coloured pictures. Both give the drawings certain liveliness.