I think your method of matching model with reference will only take you as far as ensuring that all her facial features are in correct place, but not in defining the forms. For example, the chin you modeled seems too pointy, in the reference the chin appears wider and more flat on the bottom. Also between cheeks and…
Looking nice :) Looking at that last profile shot, I think you need to either fix her upper lip, push it slightly outwards at the top of it, to get that nice curve she has between her upper lip and the base of her nose. Also, I think her jaw needs to be fixed a little. Smoothing out the back of it to remove that very…