Pick
The coloration for the pick was done really nicely and the overlapping and positioning of the pick was pretty nice. I don't want to nit pick, but there are some flaws in the piece.
Generally if you're going to a realistic rendering such as this, some things look askew. For example, at the end of the pick it looks like a layer goes over the string while a bottom layer goes under. Also at the top left of the pick, the roundness of the pick doesn't seem to go completely symmetrical with the roundness of the right side of the pick.
However, those were just said to say some flaws. It doesn't make the composition anymore graphically unappealing.