I often find that when I'm testing a wash or new colour on a scrap of watercolour paper that I produce some marvellous results, yet when I try to repeat the exercise in a proper painting it often falls far short of what I hope will happen. So why not try to capitalise on this perversity by now and then painting on a piece of scrap paper that you might otherwise throw away?
One of the main features I love is the soft wet-in-wet reflections in the water below the cottage. These were achieved by wetting the area of the water below the building and out as far as the central boats, leaving it for a few minutes to start drying, and then applying the dark green-grey reflections of the massed trees into the wet area, leaving the part directly below the cottage as white paper. At this stage it's vital to watch how the dark reflections creep outwards as though they deliberately want to annoy you. With a damp - a really 'thirsty' brush (a number 6 round brush is usually fine for this) - pull out any of the dark colour that edges its way beyond where the reflections should appear. You may need to do this more than once.
This painting appears in my Seas & Shorelines in Watercolour book, recently published by Search Press, which not only covers a really wide variety of coastal scenery and features, but is also crammed with sky treatments of all kinds that you should find useful for adopting in your own work. Signed copies are available via my website ....and don't forget to make full use of those bits of scrap paper lying around!