Following my various posts on both Turner and Constable, I had a contact from a gentleman called Pavel Mazuelas in Digital marketing at the Universidad Complutense de Madrid, who runs Fine Art Free which is a free library of 500,000 publi-domain artworks from museum open-access collections. I haven’t used it myself, sadly just too late for when I prepared my latest talk on Constable and Turner, but at first glance does look useful. Anyway worth checking out

They have also just published Romanticism Art: Famous Paintings of the Romantic Era, again very useful if you are studying that period. Constable and Turner well represented I am happy to say