Are you set up right in this pic. I thought a buck will generaly approch from the rear of the decoy. Of course this little guy proves me wrong but he is just that, a little guy. And if your buck hunting wouldn't you use a buck decoy?
The decoy is set up as a buck, if you look closely you will see his antlers in the beans. Bucks will almost always come in from the front or side. I have never saw a buck approach a buck decoy from behind.
It is the doe decoy where the buck will approach from behind.