It's not too bad a site. Needs contact details prominently displayed somewhere (i.e. email). As a more minor style crit - try and unify the font face and sizes that you use. Currently there's 3 different ones on your site. Aim to keep it one font for headers/menus and one for content text.
As for the content, I think you need to work on your lighting and anatomy. Everything just now has very soft, uniformly rounded shading, which takes any sort of contrast and form definition out of your concepts. A lot of it looks as if it's sketched in using small, soft brushes without much of a base. Try blocking out shapes in a base colour using a solid, hard brush and then roughing in the lighting with much larger and harsher brushes than you're currently using. Then you can go back and refine it and do detail passes (it looks sort of like you're jumping straight to the detail pass first).
Have a look at these;
PSG Art tutorial
Light Tutorial - Part 1: The basics