Hi @selia67 and thank you for the link. I checked it and saw, that it's actually good way with some a bit longer steps than necessary.
1 - for the moment we could leave the white dot for near future - this effect is only a small one anyway
2 - let's start with only one hand - to make it easier (as you did)
3 - here would be my way how to manage the basic 3D and shadow
Simple 4 layers. The X and Y Position changed only +- 1 point from the middle (160) at white & black part of the hand. The Shadow (Black 50% Transparency) is set at 164 x 164.
In your case I would just work with the shadow at the beginning - big effect and super simple