Re: Red Scarf
You have a natural start for a very nice portrait. I would suggest more temperature changes on the skin as it looks a bit "plastic" now. The curvature of the pupils also need to be identical at this angle.
Eyebrows and lashes: tiny brushes, soft strokes in the direction in which the hair grows will give it a more life-like look.
Nostril: light reddish-brown to almost a burnt sienna as the nostril disappears upwards.
When life hands you lemons, add some tequila, a sprinkle of salt and call me!