I love that picture Houston, nice composition/background and a beautiful animal! I agree with what others have written already in terms of set up, with this exception...
I place my decoy about 15 yards upwind of where I have a good shot too, I face it quartering towards me though, not away. A buck will approach a buck decoy nose to nose and if the decoy is quartering towards me, then the buck will be quartering away from me.
Make sure it is visible from a distance, like on the edge of a field. Some will ignore it even so, but I have never had a negative reaction from a decent sized buck. Some don't come in, some do, but none have been scared of it. I try also to use it sparingly so they don't get used to it too.
Also, do a search for the word decoy on past posts on this site. I know myself and others have written about decoys before and there is some good reading to be found there too.