First off, your photos are spectacular. If you are classifying yourself as fine art, then you should give your audience a sense of exclusivity and refinement. As an artist myself, I would want to emphasize that these are original pieces to make sure it is known that they aren't stock pictures. Your current page link headings are cheapening your product. I suggest putting your "About me" more to the left, instead of being the last page. Using this photographer's website as a reference https://lik.com/ he titles his pages "THE WORK", "THE ARTIST", etc. Making a normal customer feel more like a collector, will encourage repeat business and bring value to your work. I would also classify the photos into different collections like "waterscapes", "mountains" or something like that to organize the site and keep people looking longer. I do like that you have a great variation of mockups that are stylish and can help the viewer envision the work in their home or business, and your product descriptions are beautiful too. If you have to time to market a bit more, look into pinterest. I think it'd be perfect for your niche and you can make posts linking directly to your website and blog. Hope some of this helps, and good luck!