1) the white spots!
2) mint leaf can look fresher (w/o the black spots)
3) centre piece, in front, bottom right shadow, results in a loss of edge.
4) w/b & color tone, a little warm? (sorry using an uncalibrated screen now.. might be a wrong opinion)
5) need to show all 4 pieces or shoot them in 4's? i dunno i might like shooting one single piece alone, i.e the nicer looking one, the centre/front piece
just my little opinions, i'm no expert.