My guess is Melania Trump.

Not sure what types of watercolor you are using, but I recommend using less black when doing watercolor. It often makes things come out muddy. Watercolor has a lovely translucent quality that works best without black getting in the way.

For shadows try using complementary colors or even purples/blues instead of black.

if i was invited to give you an advice, i would ask you to stop searching for lines and try to draw forms instead. A face is just a consolidation of different volumes