I think the key to the patient and rigorous application of the Carder technique is the nurture of a special form of mindfulness. You do all the studio setup, drawing, mixing etc and there are three things left. Your focused view of an abstract shape and a loaded brush. Time and the rest of the world fades to black. The brush stroke, the flow of the line and the spectral lustre encloses the minute, the hour and the day.
Quite a wonderful portrait and top result for your first attempt.
The proportions are a bit off. Hairline to brow line should equal brow line to lowest nose, this distance is also from lowest nose to lowest chin. The forehead seems overly large and the mouth and chin overly small. These proportions are best set out with your proportional divider at the drawing stage. The eyes seem too far apart. One eye width between is standard.
Yes, everyone is different, check by measuring your photograph or direct from the model.