artquest, I love the Christmas pin/ornament! I know RedJet has some Christmas designs planned as well - I can't wait to see those, too!
I just made a post discussing appropriate pin sizes on the Clayboard, and I thought I should post it here as well.
My thought on pin sizes, in general, is that bigger is not better. In general, I feel that 0.75" to 1" in size is ideal for most pins, unless it is a long, skinny type of design. 1.25" should be the upper end on size, depending on complexity. However, simpler designs are usually much more effective than overly complex ones.
I've been somewhat surprised and a little dismayed at how big some of the pins are when I received them. Making the pins too big can make them lose any elegance or cuteness that the original design has, and it can make them borderline tacky in my opinion, which is unfortunate. On the other hand, I have also been pleasantly surprised when a pin turns out to be smaller than I feared it would be.