So far so good! Glad to see you back spriting again.

My only point of feedback would be the perspective of the back arm and the legs. The torso is rotated forward, but the lower body not to that extend. Rotating the lower body a bit more forward also allows you to space the legs further apart maybe, leading to a more clear silhoutte.

Unless you're really, really good at editing a picture of a 3D model with simply pixels added on top, I suggest you to:
(this is my opinion)
1- retrace the 3D model completely and while doing that you make it look like the character you're intent on showing;
2- or you could use the "small" sprite you had, rescale it (if you wanted it to make it bigger) and do what I said on point 1.

As it is now, I don't think it'll end up well. I mean, for consistency sake.
It looks 2D, but it isn't 2D, it's still a 3D model. The parts you're going to add on are going to look different from other parts of the sprites you didn't touch (unless, again, you're a monster at editing 3D model pictures)

And wait, weren't you supposed to use the Menat pose instead of the Jam idle? You said you would use the first, then the second/third one: which is it, the first, the second, both?