Pierre Adolphe Valette (sometimes referenced simply as Adolphe Valette) was a painter originally from France, who spent much of his career living and working in England.
He is noted in particular for his atmospheric cityscapes, full of mist and mystery. He was influenced by the French Impressionists’ fascination with the effects of atmosphere on light, and at times shared their colorful palette, but often approached his subjects wiith a soft, muted palette that de-emphasized intense color.
You can also find some examples of his drawings and etchings.
For more, see my 2011 post on Pierre Adolphe Valette.