Foot traffic is the exception to the rule, yes. Depending on the repainting cycle you could have scuffed paint, worn paint, or chipped paint. Boots sped up the process. Leaving it up to airflow alone, the rest of the airframe tended to do much better. You do see some here and there, but it's not as common as the foot area.
On this you see the foot traffic yes. Another idea you might take from it is not paint chipping, but rather the still-covered paint behind the cockpit. What you see is a fading of the paint based on gas spillage. The fuel tank ports are up in the window behind the cockpit. The white is more like the residue you'd see after the exhaust pipes. Interestingly, this is not unique to the P-40 and has some interesting effects on different planes.
This is at Clark Field. You do see some chipping and wear here, but this is also state-side. You find a lot more beatup planes stateside. They were used and abused and were training tools. You will find some in absolutely horrible shape based state-side. It should probably be discounted as one of your references.
