It looks like I am first one up so I will do my best. 

First I would crop down to the tops of the heads and up from the bottom nearly to the cue ball to concentrate on the two people. Remove the part of the arm by the head and darken the blue of the background table. Remove the arm and blue by the top right corner leaving only the shirt of the player.
 
That said I like very much the lines of the cue and the arms.  I think I would remove the white thing on the suround but the chalk doesn't bother me. I guess in a perfect world both sets of eyes would be on the white cue ball (due to the target ball not being in the picture).

Posted some of the things done but would crop even more from the bottom than I have here.

Pat