Hey Perfecto, I'm really liking the four arms. It's a keeper in my humble oppinion. Play with the second sets position and see if you can make it rock even more. Both in Y-axis and Z if that's your depth. Now, by doing so does not necessarily mean it will look better. I'm just thinking play it up and hope for happy accidents haha. I do think the positioning of the lower arms fights with the natural focal point of the face a tad.

It's probably on your todo list already, but you have a golden opportunity to add some asymmetries to the lower arms. I think it will create more visual interest, and look a little less duplicated.

Keep up the great work maestro.