2 years of classes helped Timothy Spall capture J.M.W. Turner's genius

It's not unusual for an actor to learn a new skill or how to mimic one in service of a role. Jennifer Lawrence took archery lessons for "The Hunger Games," Josh Brolin perfected peach pies for "Labor Day" and Chadwick Boseman mastered James Brown's splits - down and back again - for "Get On Up." …