Portfolio website...critique needed!

Hello! Ive been working on a design for my portfolio website for over a few month, ive found it quite difficult, due to my studys at university, and i wanted to get this website perfect and i found this the most difficult bit. I think i have got the final layout but im not sure, it still needs work. Ive posted the image, please could you comment on it and say what you dont like and what could be improved.