Help with perspective and animation

Hello!

I can’t figure out how to draw the arm on the left and have been stuck for days:

I try to use 3D models and rotate it around to get a better idea but I can’t figure it out here. I’m talking about the arm highlighted in green below.

I’m looking for help imagining how I would draw it so any help and feedback would be very helpful in helping me to get over this hurdle.

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Hey. I could help critique and give some help. I don’t visit here often so here is my discord:
FabledFrame#4140