I'm just wondering if it would be better to rename "Photography" to "Services" and then have another category called "Portfolio" where your best equine/dog images would be (and a link to them on your "Services" page.
When I went to "Photography", I expected to see galleries of photographs in various categories - which is what happens when I click on "Equestrian Events" (However, the term "Equestrian Events" doesn't immediately lead me to believe that it will lead to galleries of horses - but that could be my ignorance of all things horses!!!). The other issue with the "Photography" pages is that the header doesn't stay visible as you scroll down. So if I have seen enough on that page, I have to scroll back to the top in order to navigate to another part of your site.
The other thing I found distracting was the semi-transparent drop-down menu under "Equestrian Events". I found it hard to read.
The semi-transparent "contact me" page was also a distraction for me. If there was less transparency, so the form was a bit more prominent, it would have been less visually jarring for me.
The order of your navigation links is unusual to ME (for whatever THAT is worth!)
I would tend to go: HOME / ART / EQUINE / PETS / SERVICES / SHOP / ABOUT /CONTACT
And then under EQUINE you would have "Portfolio" first followed by each of your equine galleries &/or categories.
All of the above is, of course, just my opinion and my observations do not make it a fact.
You have wonderful images.
Good luck and best wishes