For me the success of the effect was determined by how smoothly the object went in front of the lines. The black and white image of the puppy didn't work for m

For me the success of the effect was determined by how smoothly the object went in front of the lines. The black and white image of the puppy didn't work for me at all because you could see the "pop" as it suddenly went in front. Ice-Age and the Avengers clip seemed to stand out much more for me because it was smoother (To my eyes at least).