Beautiful vintage oval girl’s portrait artwork drawing

A beautiful vintage oval shape girl’s portrait drawing, most probably a 1920-40’s. watercolor and pencil. Signed on lower left but I can only see a partial signature “AS”. Comes with gold color frame. It looks like a watercolor and pencil on linen. Measures 10 x 12 inches. it could be done on etching, but since im not an expert on art and was carefully framed and secured, it is really hard to tell. It definitely looks like a watercolor. It is really a beauty. Very Good condition with minor wear on frame.