The painting turned out to be a watercolor by the English artist J.M.W. Turner. Born in 1775, Turner is “perhaps the best-loved English Romantic artist,” as London’s National Gallery writes.

Dr Samuel Turner, 39, normally works as a renal transplant surgeon but helped set up Bristol's Southmead Hospital Covid-19 wards. The 2ft tall (0.6m) portrait captures his fatigue and dishevelled ...