Which do you think is best at giving away a weak strike: feathers on a bird, leaves on a tree, hair

What design elements make a weak strike impossible not to notice? Where do you usually look first on a coin to determining the quality of the strike?
Dan
Dan
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Morgan Dollars: Hair above ear first, eagle's breast second
Draped Bust Halves: Central portion of hair
Capped Bust Halves: E Pluribus Unum on reverse