Thanks again Jediboy , I know what you mean about cropping ( personally I find it a bit of a nightmare )
Thanks for taking the time to comment JonnyM and for your advice , I can see your point of view about the highlights on the shoulder and leg and I will have a look at some alternative settings but I must admit that the full size image does look better .
The biggest bugbear I have is with the left ear it is in total shadow with no highlights at all and has ended up looking like a black hole in the side of the cow's neck , I tried introducing some highlight to the outer edge to give it a back lit look but my skill with Photoshop just isn't up to the task .
Mark