p.s. Forgot to mention; in this case it’s just probably the flash, but I have heard that using corn syrup adds a little sheen. (a teaspoon per kg of icing sugar). I have yet to really see the difference, but I’m experimenting with it here and there. I’ll write a post if I find a way which makes a real difference.

Thanks Shirley!
Yes, that’s the recipe I use in my tutorial; nothing else.

Your frosting has such a beautiful sheen. Is it just the recipe that you refer to in your cookie tutorial or did you do something else?