i just want to help you with the link to your wip:
You have to upload your jpg ("upload your creation") the same way as your finished picture. There you check the box "it*s a sketch" (i think it was named like this).
after you uploaded the wip, you can see an url for your upload (you have to copy this url into the "Author Comments").
Actually you tried to link to your pc at home with your link in the Author Comments.
I hope this was a little bit helpful for you.
Greetings from Germany.