We use Chavant Medium NSP modeling clay, good stuff.
As for reference points, we do sometimes use cross section cut outs of the helmet to place over the sculpt to see if we are heading in the right direction. Other than that its hard to say, just keep building up the sculpt, looking at it from all angles and start to block in where each part should roughly be. Its practise im afriad. Photoshop can be helpful aswell.
As for tools, we use a selection. Flat metal scrappers for the surfaces and wire scrappers for the smaller sections. I also like to make myself tools from plastic card for those impossible to reach areas
Right... 3:09 last night... helmet sculpts done!
Piccies! again sorry for the picture quality... dark kitchin at 3am, we'd started to get the giggles at this point aswell so im amazed they are even slightly sharp lol
Few points, we didnt bother getting the visor surface smooth / neat because its going to be cut out once cast... no point. The last picture has had two layers of silicone blown onto it, next comes the thixo layers. Always fun them.
Yeah we are pleased. Hopefully going to get all the silicone on today, fiberglass next week.
I do prefer this one I made though...