It took me 15 laser sessions over the course of 20 months to remove all my facial hair. I have black hair and light skin.
There were several times where I thought I was done, but I had to keep going back because my facial hair would come back.
The reason you still have a shadow is because there is actually still hair growing underneath your skin. You'll need to wait for it to grow out again so you can zap it with laser again. This is normal. I experienced the same thing. It just means you have a lot more laser sessions in your future, sorry.
It takes a lot longer than you think to get rid of it all.