In no particular order:
'About me' page: New photo required; you want where you're looking at the viewer so that there's a connection. While this is a nice shot of your horse (HOW the Hades can anyone ride with one of those saddles???????) I will NOT be hiring the horse to shoot pictures. This image gives the impression of shyness, reticence, and/or something to hide. You should have a bit about you as a photographer and what you can offer me, and why I should contact you if I need work done. You also need to run a spelling and grammar check on your text - BADLY!
'Portraits'. You need a few more different people here. Get onto Model Mayhem, and do a half-dozen TFP shoots just to get some variety. Being seen as a 'one trick pony' (Or a one-subject photographer) will NOT help you any. Lose the image of the woman in the flowered dress & fur cape. It's soft.
'Pet portraits': Consider either adding more variety of animals or losing the cat picture and renaming it horses (IMO, the better option). The UK as a whole is horse-crazy and I suspect that a skilled horse photographer could do quite well.
'Contact': convert your e-mail address to a link so that when I click on it, my e-mail composer opens. People are lazy... Relocate (or better yet) include your social media icons on your home page as well. Chances are, no one is going to find them back here.
Overall: It's not a bad start, BUT it could definitely benefit from some tidying up. Try and arrange your pages so that there's a minimum of vertical scrolling, especially on the gallery pages. People are lazy. If they don't see it, they're not likely to look for it. Also missing is the point of the website. Are you simply show-casing your work? If so, say that. Can I buy your work? Tell me yes or no. Can I hire you to photograph my horse? If so, how? What are your rates.