I usually leave it in the freezer overnight - even a couple of days. I did one yesterday that I will put on a cake this Friday.
I would outline the head (and around the bow) first. Then fill the eyes and nose, then the bow. Then the stripes. I would pipe the whiskers on after it is on the cake and has been smoothed.
Are you doing the entire top on the cake like this, or just a smaller image?
Why not ice the cake in striped colors and just do the head as a buttercream transfer?
Yes! I agree. If you're going to do the whole top of the cake in stripes this would be easier!
Also don't forget to print out your image in reverse.
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