Thank you friends, for the comments.
To friends who want to know more of the technique of the cowling,
first painted in a shade of dark metal (steel) and then drew the spots
with quill pen and aluminum. All automotive paints.
Became very contrasted, then very gently airbrushed over the same steel
to decrease the contrast and become more intonated. I did not like it very much
because the spots were a little larger of the scale. I hope I have explained and
I apologize for my English.
