Hey replicand, this is looking great. Are you working from reference images? Where did you get them?

How do you plan to use the model? Even if it is just for practice, are you targeting it for a certain type of use, like games, film, stills etc.?

I know you use Zbrush, are you planning to finish this in zbrush? If you take it into zbrush, will you use the proxy or the smooth?
Will the triangles on the forehead and neck render okay after the smooth?