Thanks to all for your compliments
There is no complicated technique.
It is necessary to proceed with method.
I realized the camo of the fuselage before the assembly of wings
I painted the blue RLM 65, then drew the motive with pencil
I airbrush the green RLM 71 on the drawn lines
Then I painted the grey RLM 02 in the middle.
These operations were freehand I did not use a mask
The most important are to dilute correctly its paint and use a good pressure
The paint are Humbrol enamel dilute with toluene (you can use thinner for polyurethan paint, glycero),
you can dilute the paint 200%, the drying is fast, also you can airbrusht fine coats quickly.
Use this thinner only for airbrushing.
Humbrol thinner or "white spirit', "varsol" are not good for airbrushing.
This work is practicable within one hour
For the rest, it is classic.
Sorry for my english langage....