The racket face is a tab bit open that what Murray hits like. Close the racket face a bit, please
And add some wrist movement at the end of the follow through, I mean, like the players give a little wrist movement for that topspin.
EDIT: For that wrist aspect, the one you posted at the top of the page is perfect, except that Murray does not actually BLOCK ( I hope you know what I mean, the direction of the fingers/palm and the ending of the arm at right angles = block) his right wrist ( the wrist is in line with the racket handle) when his right arm is farthest back during the preparation, and again, the racket face is a little too open than what Murray would like to hit like. And, while preparing for the forehand, he brings his right hand back with a curvy motion and not along a straight line, a little curve is needed for the preparation( see Neeky's delpo forehand preparation for that, a little similar)
And, yeah, Neeky, I think Murray's forheand motion is not smooth, he DOES actually stop the racket for a moment (when he has time to hit, that is).