I think BuonRutto's right when he suggests reducing the amount of work you've got on your site. I do like the simplicity of the layout, though – apart from the sometimes intimidating amount of work, there's not too much else distracting.
I'd get rid of the separate pages with nothing but more sub-menus (like the
"main" page and
2D+3D), too. For inspiration, the layout on my own portfolio is modelled on that of
Kiosk (a favourite studio of mine); just have all your work on a single page with a well-designed navigation system. Not sure if that system is a bit too limiting for you, but might be of some help.