I like this photo!(maybe ’cause I like cows… 🙂 The composition is perfect, great depth of field. I like how all the cows are curious about something not shown(photographer). First issue is it needs straightening counter-clockwise a bit. Also the sky looks too washed out while the front fellow is too dark. I reckon part of that problem is a overcast sky? I would also move your focus point a little more from the nose to between the eyes. Maybe try cropping a little off the left side to remove distraction and follow rule of thirds, and less cropping on the legs. Great composition anyway! I’ll try to get some pics of our cows when I get a chance. (One of them’s last day is tomorrow… 🙁