Least but not last, showing the relevant pencil sketch that I had as a source clarifies my process. It also shows some initial mistakes that I had made from the start, some of which I corrected, whilst others remained till the final oil painting and were spotted (for the pencil sketch : hard ages all around the figure, very dark background, very big cranium mass and wrong placement of the ear).
Also, I inserted a new sketch which is in progress and in the far future is going to be transformed into an oil painting.
Every comment is welcome and highly appreciated. Everything that it is written here is a compass for my upcoming endeavors. Reading books is my other companion. Very helpful to a starter like me were the following titles :
1 The Artist's Complete Guide to drawing the head (Maughan)
2 How to draw Portraits in Charcoal (Fowkes)
Sight – Size portraiture (Beer)
3 Lessons in Masterful Portrait Drawing (Yim)
Drawing the head and hands (Loomis)
As for drawing and understanding color (which for me means understanding the importance of sienna ) among other books I find the
1 Portraits from life in 29 steps (Sanden)
2 Richard Schmid paints the figure
3 The two books of Mr Gurney