Beside worker of odesk I am exclusive author on envato. There are some of my approved items. Can I put that items to my profile as my portfolio for preview only. I have asked to envato they said I can.
You can. Just make sure your portfolio consists of your work, and it's labeled so it's easy for visitors to understand what they're looking at. There are a lot of freelancers who put up stock art as their own work. Don't do that.