Here you can find the work in progress on a drawing made with pencil, then scaned with sane, and a low-end as6e scaner at 300FF (near 45euros) some years ago.
Whole the work of cleaning/painting was made with gimp-1.1.25 et + (developement version that was used before 1.2.x version). (The actual stable is 2.2.0 and contain a lot of exciting new things since the 2.0.x, the 2.x series should stop complaint from everyone that dislike 1.x series)
No more description, but you can the work in progress. That certainly not the best, at the time I done this, I didn't know technics about layer (and do not know all today), and didn't follow any graphic courses.
The work is not finished and will probably never be, but I keep it here if it could help someone to understand some technics.