Here I have an oil on canvas board (basically a canvas stretched over a heavy cardboard core).

The canvas is 16 x 20 inches, and was painted for a Plein-Air painting contest on June 27, 2013. This was at a local county fair, and it took me 5 hours to paint.

And, even according to my Dad (who paints 1000 times better than me) feel's this is my best Plein-Air painting yet! Boy... did I improve!