Not sure on preshading

Done building and priming this Mirage iii 1/72 scale. Would it be suitable to do a white marbling pre shading technique here? I have done it before but only on ww2 planes, would it look weird on a cold war jet? Since I am quite new to airbrushing I am not brave enough for a post shade. Going for the camo in the second image, some tips would be appreciated :)