On your home page - I would make the introduction a little shorter - so it becomes like a tagline associated with you.
I would delete the "Hello" and the "with a passion for photography". Every man and his dog writes that and if you have taken the trouble to dive into photography as much as you have, then it is a given.
I would also delete "Thank you for viewing!"
That would leave the message as your name/location/photographer/what you photograph = simple, clear message (and good for Google searches)
Menu bar:
Are you intending to add more category links to "Photography"? Because at the moment, you are asking visitor to do an extra click - not clean/efficient.
If you are going to add more categories, then my change the top link to "Galleries"? (seems a little more descriptive than the generic "Photography")
If you keep Portfolio, then I would suggest you limit the number to your VERY BEST images and to those that show the breadth of your photographic abilities.
One thing you might want to think about is to make your Home page just a landing page that includes:
* Menu/nav bar
* your present message
* icons/links to the other websites that you have on your "About" page
* Plain background (that makes it easy to read the text)
At the moment you have three pages that show exactly the same thing.
Homepage has a manually operated slideshow
Portfolio has the same thing
Slideshow is a slideshow of the same thing.
I would expand on the "About" page - here's the opportunity to sell yourself and your services.
Maybe search for "About" page examples or tips
On your "Portfolio" page your "Search" feature is below the "fold" on my 15" laptop screen. This could easily be missed as the main photo and the strip below make a complete viewing package.
Is it possible to move the "Search" feature up to the menu bar?
Your website is not mobile friendly - if you say your portfolio on small screen devices, you have to scroll sideways to see the main photo. You can't see the whole photo at once.
This website allows you to get a simulated view of any website on a wide variety of devices. You just type in the web address and then select the device and screen size that you want to see a simulation of.
Screenfly / Test Your Website at Different Screen Resolutions
About 60% of all the visitors to my website are on a mobile phone or tablet. So you need to make sure your website is a good viewing experience to them.
All the best - you have some terrific work.