Antique Miniature Portrait: Woman in White Turban Against Blue Wall

This miniature is painted with what looks like watercolour on paper and would I believe date to the early 1800s, circa 1820. It sits in what I think is its original simple ebonised wooden frame with gilt slip. And I love the way she sits in front of what looks like a blue wallpapered background. She wears a white turban and an extremely high collared top with evidence of a black shawl around her shoulders. Her tight golden curls escape from her turban framing her face and her dark eyes look intently at your with her mouth firmly set. For me there is almost an impressionistic feeling to the painting of this portrait, and I struggle to call its style naive. The portrait is neither signed or dated and I have not opened up the back to see if there is any verso on the back, but I wouldn't be at all surprised if there was some text there it wasn't in English.