Always working quickly in the open air on–site, Stewart called his impressionistic painting style from 1925 to 1935 "Blood and Thunder." About his marvelous works of this era, Madelyn McGown perceptively wrote: "He painted with a heightened sense of color and with a thick impasto of paint richly sensual and highly wrought, but always under superb control. He turned to large canvases, and many of those he completed, incredibly in an afternoon, a feat of an almost unbelievable nature....This was his 'big' period, when technique was wedded to a keen eye and a robust zest and joyousness in his powers as a painter."