Watercolor signed and dated Donatien Roy representing Saint Sebastian on Loire

I sell this watercolor signed and dated by donatien roy (1835-1930) at the bottom left. It measures 18.5 X 25.5 cm on sight. There are slight traces of moisture on the left on the watercolor (see photo) Other traces of moisture on the back of the painting. The frame is gilded with an accident at the top left. The setting is period. Donatien roy was a notary and painter in nantes. His family owned the sugar factory. His brother was a surrealist painter. His son was a painter and curator of the obrée museum in nantes.