This is good training. But, IMHO as Punch said. I like to have a blank target (white/black/brown/burlap) Then I pick a spot on this and shoot. your training will help, but I think you will be amazed that shooting at even burlap bag your eye will be drawn to something. Like looking at a white wall with nothing on it, human nature is to spot something that stand out. I do train as you and found it works well to train me to blur out the rest to focus on what I want to shoot so when Mr. Bullwinkle comes in I can blur out the head and focus on the hair in the kill zone.