Comments, where are they ?

Hi Guys
I don’t see the comments fields on some of my pages as
http://www.thierrydehove.com/portfolio/
http://www.thierrydehove.com/category/photography/cars/daytona-rolex-24-hours/

but I can see it on this page and I got some comments by the way
http://www.thierrydehove.com/2010/02/14/digital-expert-photography-strategic-planning-organizational-design/

I do valid them on each pages to allow comments but where are the forms ?

Please let me know
Many Thanks,
Thierry
http://www.thierrydehove.com