Acrylic.    This was done for an art show with a "water" theme. My father in law (we call him Papper) took the photo years ago and it is such an engaging scene I thought I would paint it for the show.  Time was short - I thought I would try a watercolor to use some "watercolor canvas" I had gotten as a gift.  Tried it and hated it - the paint tended to bead up, and if I got it on, it could be washed off with the next strokes! So, since the canvas was for water media, I went to acrylic instead.  Acrylic is a pain because it dries so fast.  I used some glazing media to slow it down but even so...  I like the painting and have in a dark blue frame so it looks good.  This is a gift for "the Papper".