is it possible that i can write my flicker portfolio link in description when i send the request for buyer?
Yes, you can - it’s in the list of URLs which can be used:
Thanks for this. It’s really helpful.
The following URLs may be used in your profile or Gig description:
ammyy.com blogspot.com dafont.com dailymotion.com flickr.com mixcloud.com reverbnation.com soundcloud.com teamviewer.com tumblr.com vimeo.com wetransfer.com wikipedia.org wordcounter.net youtube.com
Note: If you use a URL, which is not in the above list, it will be removed from your profile. If used in your Gig, it will be denied. Repetitive violations may cause an account to be restricted.