weeee my first redline - I hope this is alright! o/
redline here ~
Ok, regarding the curves and such ~ I noticed that you drew the back rather rigid and straight.
The human spine has a really nice, natural S-curve-like shape, that goes all the way from your neck to your tail bone. So don't be afraid to really get some curves in there C:
Also! Forgot to write this in, but in that pose your shoulder blades would be protruding a bit.
Try puting your arm in each position and feel with your shoulder blade with your other hand.
I though the torso was a tad too short, so I lengthened it a bit ~
I shortened the arm a little bit as well. The wrist should be at about the crotch, and the elbow at about the waist C:
Aaand for the neck: remember that your neck is a part of your spine, and so it will flow with it.
Fixed a little problem with the hair as well ~ if her head's turned like that, her hair from her right
(our left) ponytail would naturally fall down her back, and onto her dress.
I'm probably forgetting something OTL If you have any other questions, or need something cleared up feel free to ask~! <3