Greatest consideration is that content remains king and one page is one page; and ultimately, SEO isn't about rank but getting the highest volume of qualified traffic that converts. A page about red apples will generally rank higher for "red apples" than a one-page site about apples, on which you discuss red apples along with green apples, crab apples and apple pie. No, it won't rank as high for "apples" but then, you don't want all the apple traffic to that content, you want the people searching for red apples.
This is always a tough question for photographers, designers, artists, web developers, etc. who want/need to show their work and in whom the design of your own web experience is probably more important, so as to convert the people who visit the site (who hires a great designer that can't design a great site??). BUT, you can't convert traffic you don't have. Put yourself in the shoes of your customer and think not about what you want or what converts best, yet, first think about what they are seeking. An artist? People are seeking your specific style of art, custom work, price point, scenes, etc. (I imagine). Having a page specific to each of those things, enables you to capture the audience seeking that which you do. THEN you can convert them.
It's about balance, not panacea (not suggesting you're looking for that; rather, making the point). Those cool looking websites on a single page that fluidly slide and change as the visitor clicks the nav almost invariably, never rank well. Doesn't mean they aren't right for a business or website, just consider the balance of great, innovative, intuitive design with how people search and click on results.