This is an original watercolor painting, or you can purchase a giclee, which looks virtually identical. Giclees use archival ink on archival paper or canvas, and this one is pencil-signed and numbered by the artist (limited edition of 250).
An 11x15 would mat/frame into a standard-sized 16" x 20" frame. The colors in view 2 are pretty close to what the painting looks like, although the image was created to be slightly lighter than the painting, so it is exactly the same when printed. The other views are images taken by the artist (not professionally taken images).