I have enjoyed looking at these. I prefer the grouping in the first shot i.e. stacked and just slid together, not arranged. Although, I would rather see the coins come all the way to the bottom and fill the frame.
Something about the lines and the order of the second one makes me nervous. (I have obsessive tendensies and I want to turn them all heads or tails up and face them in the same direction...but I can't...so I don't want to look at it.
)
I like the DOF idea in the third as well. Nice shots, thanks for sharing!