I have been prepping for an upcoming watercolour class that I'm teaching on windows, and this is one of the samples that I've made to show. It's not what we're creating, but a variation on the theme. Here is WC Window Set #5014 from Art Impressions:
Also used are WC Foliage Set 4, WC Mini Critter Set, WC Wishing Well Mini Set, WC Harvest Set, WC Mini Flower Set and Foliage Set 1. All markers are Tombow Dual Brush Pens.