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Hi Molar, based on your goals for this site here is what I think will make it better:
New Background. The wood texture is not working, especially when combined with the low opacity black layer you have over it. I would suggest finding a texture that best suits your layout, if you want to keep a texture as your background.
Remove the color pencil containers. It seems pointless, out of place and your design would benefit from you removing it.
Find your focus. At first glance, it is hard to find where you want to find your visitors to focus their attention, which can be hard for dark web designs. You should follow this link to get some good inspiration by looking at other dark web designs.
Look into what it takes to make a strong portfolio. From what you mentioned you want to have a really strong portfolio site, but to do that you have to know what makes a portfolio site strong. Smashing magazine has a great article on 10 steps to the perfect portfolio. You can also find other good articles related to this.
Better color scheme. Your current scheme does not have enough cta to draw in attention from your visitors. Color scheme designer and adobe kuler are great resources to help you with this.
Work on your layout. The single page concept is cool, but the way you present your information needs some reconsidering. I get a cramped feeling from your design. Try adding some white space, this will give it a more professional feel and make it easier on your site viewers.
Overall your site shows promise and if you take your time, not rush and cater to every detail it could be great. I will be interested in seeing how you progress with your portfolio.

Probably I'm going to rethink my all portfolio site.
Thanks for the detailed review! :)