St. Paul’s from the River: Morning Sun in Winter, Henri Le Sidaner
Link is to zoomable version on Google Art Project; downloadable version on Wikimedia Commons. Google lists the original as in the Walker Art Gallery, Liverpool, but I can’t find an image on their site.
Le Sidaner shows the influence of Monet, and I think Pissarro, in this view of London in which the intense winter sunlight simultaneously reveals and almost obscures the buildings across the river. The brilliant dots of color are so small as to suggest an approach bordering on pointillism.