The curve isn't much and it was switching back and forth for me today. The reason is the right side of the neck sticking out a bit too far. When you look at the curve between the tusk tubes on that side you can see the neck should be a little further in to follow the curve. However, the fix is going to be tricky, because I really like the curve you have on the neck. However, when you make the next cast, you could try and push in that side a bit when it is still curing or you could just cast it as-is and then sand the area. I think if that area is addressed it will automatically get the correct curve to the mask as the original. The fact that you even captured that in a free-hand sculpture is pretty damn amazing.

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, on Flickr

Incredible work!!

Looking really lovely.

A problem most sculptors run into when working on a Vader helmet from scratch is that they sculpt the dome separately and when they pair it with the face mask they find that they don't fit or look good together. I would actually suggest that you can use one of your face mask casts and then sculpt the dome on top of that in order to get the shapes looking right. You may even be able to do it with your current dome sculpt.

Looking cool. I can spot a few things on the dome. You need to lower the groove between the top of the dome "bowl" and the "skirts". It's sitting too high. Also the top "bowl" part needs to dip in a little bit just before it meets the groove. The "skirts" also needs a bit of work, but getting the groove position right first is more important before working on the those. This will give you that distinct profile. As always, if you have any requests regarding reference on the dome, I can send you some shots of my 3D models from any angle you require.

The face mask looks spectacular. Well done.