Hunter Biden, his name forever linked to President Trump’s impeachment, says painting “is literally keeping me sane” after years of addiction and poor choices. Dressed in Oxford boots, jeans and a long sleeve T-shirt, Hunter Biden ushered a reporter down a stone walkway, into a pool house-turned-art studio in the Hollywood Hills. It was filled with colorful works of decorative abstraction — psychedelic florals and ethereal patterns that look like nature viewed through a microscope, leaning toward the surreal. There were nearly 100 of them, all by his own hand. Some were signed RH Biden, for Robert Hunter Biden, the...