Who is the author?

[Amateur]

Сообщение от belmar

Now, if I have any questions on hardboard, I will know whom to contact.

But an interesting fact. Of course, I have no way to generalize, but nevertheless all the pictures and sketches I have ever seen, and which were written on hardboard from 1939 to 1949 (about 10 - 15, all British, Danish or Swedish), were written on the side with relief. He primed with, and then paint, with relief, issuing through the paint layer, as if imitating the structure of the canvas. In our time writing on the smooth side of the hardboard. Can anyone say why "changed direction" and when this happened?