I´m doing some more tiny pen and ink sketch portraits, about 1 inch high. I think these turned out OK - mainly because I am using a 0.05 pen now. Its quite tricky as once a pen mark is made there is no going back!
I´m finding it easier to draw the hair, jaw, cheeks etc first, and then move onto the facial features. Although I am still having trouble with eyes and mouths! Practice practice practice!