Does it have to be your own lineart, or anything suitable will suffice?
I used to experiment on scanned illustrations from
a very old and rare Soviet book I have (
like this). I have the relatively
high-resolution png scans of various illustrations from that book. I don't think the defunct publishers of a defunct country will complain about the misuse of their pictures here, should I post it?
Not sure if anyone will be particularly interested in illustrations of retrofuturist vehicles, but I want to add it all to the collection. Maybe someone else will find it handy some day.