Nice little scene They're a couple things that could be improved in my opinion though.
The main one is that the foot path is higher than the ground around it, it should be lower and I think I would prefer the landscaping without and of the lime green mixed in, flowers would add some contrast and look better. These are just suggestions and my opinion
The wagon hitch is creative and looks excellent, I think it might be even better if you could attach it to the bottom of the wagon instead of the top.
Overall a good MOC
p.s. I've worked on a dairy farm for over 10 years and never seen a cow stand on a fence like that