This is A3 format good quality watercolor paper. Idea is from YouTube, according to the information it has been painted from a photo made in Corsica. This one needs a lot of drawing. One of my favorite watercolors is 'transparent orange' (geman: Lasurorange) from Schmincke. I love to paint roofs with this color. I hope it is not too bright. Usually my paintings are quiet regarding the color but here I couldn't resist to use it :)
This is quite a challenge and if you plan to paint something like this it will lastyou some time.