Hi, here's a head I'm working on. I'd love to have some fundamental suggestions on improving its realism (proportions, positions, shapes - that sort of thing.) As you can see my reference image isn't great, but I'd like to match this head as much as possible.
This is my first ZBrush project, so please feel free to point out anything.
The eye an nasolabial lines shoul both me smoothe a bit, the nose should be widened, the chin should be pushed down a bit more, the jawline could be a bit more tapered, also the ears could probably be shrunk vertically and pushed out horizontally. Also, the neck is a little long and it seems like you've started to model the neckline but stopped halfway through with how it juts out. The back of the neck in the profile view could also be pushed up and widened to look like it starts to become concave closer to the bottom of the skull. I can work on a mock up in Photoshop if you'd like.
Attached is how I would sculpt it, simply using the liquify tool in Zbrush. It isn't perfect but I think the liquify tool is a good tool for deciding what changes need to be made on the model without having to sculpt. On your sculpt, I think the cheeks are a bit large, you went a bit too far taking away the wrinkles and the lips are too thin.