Nicely said, Andre, and illustrated too
You're right about the softness of the light and air, and the subtle variations of greys and greens. I think there's something, too, about much of the landscape of Ireland and the UK -- the variety of landforms in a relatively small geographic space.
"Soft" isn't a word I often use in describing our climate & weather here in Eastern Ontario -- I've used it in BC's lower mainland and on Vancouver Island, but here, er, not so much.
So on my midweek trek along the river, I thought about a photo, but then decided agin it -- it would've shown a sweep of dark grey, the open river, lined with darker grey-to-black trees on either side. Sometimes, the scale of the landscape intensifies the effect: the river is nearly a kilometre wide at this point.
But, what a difference a day or two makes! The wind shifted from the SW to the NW, banishing soggy grey days and damp winds, and bringing brilliant and unclouded blue skies, brisk winds, a strong bright SUN, and daytime highs around -8.
But here's the thing: Those temps of -8, even with windchill, couldn't dispel the warmth of a sun that's noticeably higher in the sky. For much of our Friday walk, I didn't even bother with gloves. With this uncompromising continental climate, I sometimes forget that Ottawa is only a couple of degrees of latitude above Marseille, & essentially the same as Milan. A bright mid-January sun lifts the spirits.
But keep those midwinter watercolours coming, eh?