I'm glad I started posting my work in progress on Vader since the beginning, so you can all bear witness to my descent into madness.
I'm started to become completely obsessed with this project.
This past week I started focusing on the face mask again. I spent a few hours reading rpf and propden threads about Vader. Made side by side comparisons with my mask and movie shots from various angles.
First I started sanding small spots here there. Dremeled the nose to be deeper. Then I thought I want to resculpt a cheek here and an eyebrow there. Finally I thought, why bother with all these details if I don't address what makes his look so unique: the crooked mouth and neck.
So I decided to go all the way in making this as accurate as possible.
I so far cut open the mouth and angled it more, and started sanding the neckline a bit. I'll have to sand and sculpt quite a bit to make this work, and redo the chin vent again.
Here's my current progress. I started using my Too much garlic ANH Vader helmet for comparison, since the 3D aspect makes it much easier to detect flaws in the HT sculpt.
And here a (crude phone) edit covering the open areas, to get a better feel for the proportions: