I only managed to paint three out of four so far. These are painted on A3-sized plywood, which I bought in the building supplies store, and painted both sides with white.
Even though I painted both sides, some of the five sheets I bought did warp a bit, and none of them stayed really flat.
It was interesting dealing with the third, the painting was intended to be of
my niece, but depending on what errors I made in composing the face, the
image flipped between being of the niece, or her mother. I guess they look
a bit alike. The end result is that the painting looks like neither of them, but clearly the features are recognizable as those of either of them.
Anyhow, here they are.