Add profile image to Sitecore contact

You can use below method to associate image to Contact.

using (new SecurityDisabler())
      {
          var image = "PASS MEDIA ITEM HERE";
          MediaItem getmediaItem = masterdb.GetItem(image.ID);
          var stream = getmediaItem.GetMediaStream();
          var memoryStream = new MemoryStream();
          if (stream != null) stream.CopyTo(memoryStream);
          var pictureFacet = Tracker.Current.Contact.GetFacet<IContactPicture>("Picture");
          pictureFacet.Picture = memoryStream.ToArray();
          pictureFacet.MimeType = getmediaItem.MimeType;
      }