I really like overall white gleam in the shot but maybe the shadows on the straws lets this down.. If the shadow had been more of an integral part of the pic(like showing up for the glass as well) then it would have looked much better..
The bands of color on the straws throw this off for me. Perhaps the same thing with clear, straight straws? I think then the lemon would've really stood out as a focal point of color. I like the composition.