Thanks for your feedback!
Navigation: The reason this is inconsistent is because the portfolio page isn't actually a page, but intended to be a separate site, which is as clean as possible with as few distractions as possible (i.e. not too many menu items). I could try and make the menus more consistent, though, at least the main one (i.e. the one with the "About" and "Contact" etc.).
Numbers: I can have a look at some sort of highlighting option. It'd be nice perhaps, for when you click a number, the image in question flashed or brightened for a few seconds. Not sure if this is possible, so I'll have a look at it. I'm not keen on adding actual numbers next to each photograph. Alternatively, I could make the numbers into simply dots. Don't know if this would be better? I.e. they're not numbered, it's just links to the various images? If you see what I mean...
It's not a stupid question! The reason for the portfolio page is simply to provide a quick, clean, relatively fast loading, uncluttered way of viewing ~40-50 of my best photographs (in my opinion) at a glance. It's supposed to provide someone very quickly with a glance at the sort of work I do. The main site showcases ALL my work, album by album, in categories (portraiture, photojournalism etc.). The portfolio is much more about giving a quick and straightforward representation of my work so far and what I'm all about.