Using Smart Fill To Change Drawings Outline Colour

Happy New Year people.
Have spent a while searching, trying to work out how to attach photos to post in a coherent manner, sorry no joy.


I scanned the drawing at 300 dpi and saved as a bmg, then imported, centerline traced, line drawing, and saved as an svg file.
Then tried to use the Smart fill tool to change outline,lines colour to a light green.
Nothing happens.
Can't upload the svg or cdr version.
The drawing is part of a woodcarving project I want to practice carving. Drawing is copied on to the wood using carbon paper. As the outline is black if go over with a black pen can't follow where I've traced, same with any other colour of pen. If I change outline to a line to a light green, then can see where I've been coping the drawing.
Thanks.