I think the point of Ptoing was... Shoulders are ball joints, so are hips, consider that you will need those, and don't have them.
Hips could go I guess, but it's just much nicer if you make it fit together. You could even make three hinge joints at different angles to create your own 3-axial rotation which simulates a ball joint more mechanically interesting.
Also, the triangles are reasonably neatly spread, but then around the ears there's this huge clutter, you can most certainly lose some of that, as it completely doesn't match the overall detail like this.Then if you only wish to put joints in the torso, what's with these hands, will you rig them? Or are hyou going to change those into some (perhaps more basic) mechanics as well?