I don't touch facebook with a 50 foot pole--but I can say if you are building a portfolio, something pleasing to the eyes and professional (while still being 'you') is mandatory as far as the layout goes.
Don't just post a bunch of pictures and text. Design everything else around it, like you would be proud to hand the link over to a potential employer.
Now do I know if you are able to change the layout? No. But its worth looking into--and if that fails, ditch facebook and go with a web domain.