You have a lot of nice images, so congrats on that! I particularly like some of your landscape shots. I don't know if you're using a template for your website or not. If you are able to customize it, I would suggest the following:
a) Try putting the My Photography link up at the top. In fact, I'd rename it Portfolio as well. (edit: more thoughts on this down below.)
b) When I view your portfolio, the thumbnails are huge. I wouldn't even call them thumbnails. When I clicked on one, it barely increases in size.
c) Like Doylem said, scrolling down to see each image can be slow. In addition, scrolling, for me, tends to hide portions of each image as I scroll down. I typically use the page up/down button on my keyboard and it can be tiresome to consistently scroll up/down incrementally just to see the entire image of one photo and have the same dilemma for each additional photo. I do like, however, that your page is dynamic, but that still doesn't alleviate the issue for me.
d) What is the purpose of your website? Currently, it appears the purpose is to sell your images. If so, I believe you need to rethink your design. Your images shouldn't be contained within a Portfolio or My Photography buttons. Instead, you might break down your images into categories to make it easier to shop. And I would limit the amount of print sizes/options for purchase. I stopped counting how many variations were offered after 75 and it appears there were at least 150 more options after that. While it's good to provide options, that will typically only confuse a buyer. If you really, really want to provide options, consider upselling a couple of options at checkout, otherwise offer only a few sizes and pick one finish you think will best represent your image (matte, glossy, etc.)
e) If your intent is to showcase your portfolio, I would still categorize your images and remove the buy buttons. You can always add another link to purchase a select group of images but I would only choose 'your best.' And then see item (d) above.
f) It might be good to have an About Me page and a Contact page. If someone wants to hire you, how do they contact you? If someone wants to purchase an image, a short bio or information about the artist can be helpful.
These are just my opinions and I hope they might help you. Congrats again on making the leap and putting your images into a website. I hope it goes well for you!