[V3N0M1300]

I posted this question on mission 4 today but I haven't got any answers yet. Where is the line between an authentic looking skin and a funky one? Are there any specific places that have to be camo or bare metal for it to be realistic? Were there regulations for what pilots could and could not paint on their planes?

Somewhat related, would i cross the line if I painted a big star against a camo background on top of the plane, sort of like the one on one of the A-wings in this pic?