Herd o cows - that works! Black againt black is very hard on the details. Image is a bit small for all this activity. Heavy haze in the distance, probably not good, but honestly nearly out of the picture. 6 Rob the Swash
This is a tough challenge. All of your subjects are very dark and fill about 1/3 of the image. If you used an averge metering method, which I suspect since the foreground and background are nicely exposed, your subjects will be under exposed. One solution here would be to use a different vantage point to eliminate some of the bright background and spot meter on the area you want to expose for. Also, using and ND or polarizing filter might help.
These cows are just too indistinct. It's hard to get close with live, untamed animals though, I can appreciate that. Maybe next time try caturing a few stragglers that are not all in the same group.
I like the mass of cows - like one animal, with some white faces peeking out, but they aren't in focus - and there needs to be more focus to the composition too - less sky would help - or perhaps zeroing in on one cow,
kinda dark on the cows scene is just too high contrast for the camera to handle might want to adjust the levels some to bring out the detail or use a polarizer to get more from the sky and water