You asked for harsh, I am going to give it to ya.
Here's my own personal little novel. lol.
Typically, people are attracted to happy, brighter colors. While I know it would be difficult to change the whole site, maybe you could consider using a different layout with brighter, more fallish colors. Most farm website owners change their websites with the seasons. Along with that, if pictures are going to be placed onto a website then they should be of at least medium-high quality. The pictures that I saw from the very first page are low quality and not well planned out. Consider asking a friend with a high quality camera come and take pictures of your animals.
As stated above, your top banner picture is very low quality, not only that but it is very personal. Since this is a farm site, you really don't want to be too personal. A good picture to have as a top banner would be a picture of more than one horse out in the field or multiple animals together. Also, consider looking into a program like Photoscape to add professional looking text and effects. If you would like some graphics, I would be happy to help you.
One more thing I would like to point out on the home page is your barn manager's names. Because your website is run with a business like structure, consider putting the manager's full names. Not only is it more resourceful, but it also is much more professional.
On the horse and pony page I noticed that one picture you have very bright text and graphics on it. That is a big no-no. Sure, it can be fun to play around with these pictures, but save those for yourself. Try to find the best conformational pictures of your animals as possible, or put up pictures of your animals competing in whatever events they specilize in.
Another quick I noticed on your h/p pony is that you have a picture of a girl standing on the back on a barebacked horse at the bottom. You don't want to imply in any way that you support dangerous actions at your farm. While I am sure you knew the horse wasn't going to do anything, visitors to your site/farm may not know that and may take it the wrong way.
Some grammar things I wanted to point out. A big no-no in farm/stable sites is using "I", "me", etc. Since typically one person does not control every single action at a farm, it is best to use "we", "our", etc. Once again, that comes into that personal factor that you want to avoid.
That is all I notice at the moment. Sorry for the novel. I am a website junkie. :)