Well, first thing to keep in mind is that sculpting, like drawing, painting, or playing a musical instrument, is a skill that is developed by practice over years. If you are new to Zbrush or sculpting in general, there is no reasonable expectation that you would be sculpting like you weren’t. So be sure to have reasonable expectations for yourself.
Other points:
-
Reference is useful–sculpting from quality reference is the easiest way to improve your results–but it will not replace a general knowledge of human facial anatomy. That knowledge is how skilled artists can “fill in the gaps” when looking only at a limited, single view of the subject as you are here. You still need to understand general anatomical proportions. The only way to do this is to study it and practice–over and over.
-
It can be useful to first sculpt some sort of crude skull that is proportionally correct, then start building up the face over it.
-
It may be easier to get the proportions correct on a more neutral, symmetrical pose. Sculpting in a posed position is an advanced skill.
-
Faces look weird when they are missing prominent features like eyes and teeth. It would be a good idea not to overlook these features, and to model them as separate subtools so you can sculpt around them, but still see them as the important landmarks that they are.
The following I only volunteer because critique was requested.
-
Specifically with this piece, the chin is a bit wide and prominent. This may be contributing to the masculine quality you are feeling.
-
Without the ears, it will be difficult to get both the proportions and the line of the jaw correct. I know ears are difficult, but they need to be there as a landmark. That head will always look alien without them.
-
The eyes need much more attention, but remember to sculpt them around actual eyeballs.