|10x15cm (approx.4"x6") each|
I explored the art store in Helsinki and found there the nice 30 sheets set of Hahnemuhle watercolor paper, postcard size (It is here, not very good for watercolor, to my point of view, easy buckling when meets water, but restores shape when dry).. The back side is lined as post card and the front side is open for imagination.
My first 4 experiments with handmade postcards and the paper are here today.
Yellow tree is from imagination, apples and green trees are from photos, the sea is the copy of fantastic Arnold Lowrey watercolor (link to his site)