Thank you Sirs, for your interest and for sharing your ideas and experiences.
@ MuskyGary - thank you for your info, in such video Chris showed a dusting tecnique over the inner skin layer, instead I found (as CTom) another video of him in which he showed the real dry brushing inside a silicone mold.
@ CTom - thank you for your trials, I'd love to see your results. I agree with you: Tomy maybe uses several techniques, in series, and yes he uses his own silicone molds, no alluminium, no resin stone ... at least I saw only the silicone ones in his pictures.
@ Olsarge - your technique is similar to that one used by Chris, that is the skin pouring and the inner dusting. Perhaps Tomy realises the angled white belly with this technique, I say it due to the dull pearlescent belly appearance. Instead the back and lateral lines could be realised with a really thinned varnish, coloured with pigments and applied inside the mold with a really thin brush before of clear injection.
... if you like, the brain storming is just started.
Bye
Cami