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This is using Zbrush.

Oh Zbrush.
I'd also seen a post using Zbrush.
How long have you been using Zbrush?

It is not an easy question to answer. I have been using it on and off since 2006 but never really used is seriously. I had not really done any 3D work for a few years. I started working with ZBrush properly in February.

So the answer is 3 weeks of 13 years depending on how you look at it.

Oh I see.
You're talented and flexible and could easily manipulate in learning new things I guess.

I have primarily been a 2D animator I also have also been working a lot on anatomy and drawing the figure for the last few years. I also spent about 8 of those 13 years working with more traditional 3D software. Add to that about 30 years worth of drawing every day.

My skills in ZBrush are something that is new but I can progress this quickly only because I have a lot of transferable knowledge.

I have actually been surprised at how good my sculpts have been, when I tried to use it before I had my 3D hiatus all my work was really horrible.

That's a great experience!
I hope you can share your experiences and skills to many people and maybe to your kids.