Thanks for your comments.

I think I have to wait for the colours, to see what it gives.

The shadows are bright and orange now because of the color of the parchment. To draw those shadows, I just made a overlay layer, and draw the shadows with black. As it's in overlay, it darkens the place where I draw... And as for now, there's only the parchment, it darkens the parchment. When I'll put the colors, It will darken the colors, so it shouldn't be orange at all (except if my colours are too transparent).

... that's how I understand it... maybe I'm in for a very bad surprise once I draw the colours...
But, as I'm fellowing the tutorial of Jon Roberts, I just trust the master... and hope for the best :-D

Let's see that tomorrow or sunday !

Thanks anyway for your comments,

Best regards