Thanks !
In fact those panel lines are pretty simple to do.
After I finish decalling, I spray the whole thing with gloss coat (again) and after 24 hours is ready to feed panel lines with some shade. I use Michaels acryl paint dilluted with water and soap (dishwasher - just few drops). Than I put this mixture into panel lines as accurate as I can. The capillar effect takes place most time. The rest just clean as usual wash with wet paper towel. Depends how much dirt I want to keep, I can remove almost all paint and leave just highlighted panel lines.
a bottle of paint is about $0.65 at Michaels and they have tons of shades available
on thsi picture you can see the tail being applied however the rest of the craft has been cleaned up already
Sure I did preshading and some postshading. OD is too boring to leave without such variatey of shades.
After it dries out (cleaning) I put a dull coat and that is it.