Hello to all,
Thanks a lot for your comments.

Following...

First, I "soiled" engine but only to practice because it'll be hidden. So, I not detailled it.


Then, I painted interior canvas just behind gunner. A little didactic as usual (of course, I'm a teacher...).

Base (painted with hairbrush and Tamyia colors):

Tools for smudging:

In my experience, it's better to wet pencils to avoid scares on painting.

Then, working with wet rubber brush until you like the effect.

Canvas is almost ready. A little bit oil on leather parts.

Hoping it'll be helpful.

Best regards.
Alain.