Looking pretty good.

Your model looks great. I like your detail in the mech arm and in her form. The breasts look more natural here.

The one thing I find strange are those long pigtails. Too me, it seems like they need less of an arching curve and need to just 'drop' along her back.
That and her back, a bust that big, makes me thing she needs more of an arching back, though I cannot tell too much from her back here.

I would say ask your sister for more feedback. But right now it looks like you are on a good start.

Extra arms, twin hairtails and a tail, quite an interesting character design... I wonder what her personality and backstory is like...

Wow! how much are you charging or sculpy work anyway?Though ive never usually been a one for 3d this has me sorely tempted.

i simply need to get funds if you ever do commissions like this.would love to get one