Hi Luke,
I like your website - particularly the clean and simple look. My only comments / suggestions for improvements (and I don't profess any expertise in this area - so what I'm about to say is just my opinion) are:
1. the "index" is a bit "too" understated as it took me a little while to find it
2. the photos scale up well enough but a scroll mechanism or arrows to navigate forwards / backwards would help, I think.
3. a bit of text would help.
4. some links from your "clients" page to the content you did for them would probably give prospective clients more of a feel for your style / imagination
Of the photos you've posted, my favourite gallery is "still life" but the moon shots are also really good.