Use urlgen( <http://www.spadixbd.com/freetools/urlgen.htm> ) to 
generate a list archive pics url.puregraffiti.com forum pics are
number queue.
<http://www.puregraffiti.com/forum/upload/attachment.php?s=3419c2b884ab84f52731b9e9d7e3cf4c&postid=1000>
<http://www.puregraffiti.com/forum/upload/attachment.php?s=3419c2b884ab84f52731b9e9d7e3cf4c&postid=1001>
...
...
<http://www.puregraffiti.com/forum/upload/attachment.php?s=3419c2b884ab84f52731b9e9d7e3cf4c&postid=379905>

You may need to change "3419c2b884ab84f52731b9e9d7e3cf4c".

Start a new winhttrack project,select action:"get separated
files".
use Url list (.txt):open text of list archive pics url.
change browser ID.
setting MIME types: MiME identity: "image/jpeg"(first one)
to change 
attachment*.html to attachment*.jpg.

I have noticed many archive pics of url number don't
exist.the 8kb file is not
picture.