I think the crux of the matter is what are you using from the default? Many of us get away using the default "fiddly bits" (gear, prop blades, wheel wells, flap interiors, etc). If you just use the default skin but add noseart, or just use the default skin and put your own nose stripes, wingtip markings, etc, you will find the unanimous response is "go back and do it again"...
If you use the original as a template and draw your own camo, even if you follow the same lines/demarcations as on the default, you will be on the right track. You'll find most people do something like this. That means layering your own details, rivets, panel lines, weathering, on top of your own camo layers.
So in short: doing your own work is the key. If you base your work off the default or get inspiriation from it that's fine, as long as you do the work yourself.
I hope I'm not speaking out of line but I think I speak for most skinners when I say that.