Welcome to the site, it's good to have you here. :)
Your drawing looks nice, love the outfit you gave to her!
There are indeed some anatomy/proportion issues with the picture. It's hard to give criticism on it without going into insane detail and making it really confusing, so I'll just point out a couple of prominent things.
To begin with, I noticed the hands first. They're probably the hardest part of the body to draw and the bane of most artists' existence, but diligent practice can help with that. Try our Hands and Feet practice tool to study hands and see how they fit together, it will be very helpful.
Besides the hand, your general proportions are a little off. That's probably because you don't fully understand how all the parts fit together, so it doesn't look natural, even if everything's there! A good way to get comfortable with and understand how everything clicks is by doing gesture drawings using the practice tools.
There are some super useful articles that explain how to break it down:
Try drawing these in 30 seconds. If that's still too fast for you, I recommend 60 seconds but no more. Your goal will be to draw gestures in 30 seconds.
If you practice with these and keep up with it, you will be able to build new images on top of gestures, and you will find that not only do you gain better understanding of how the body fits, your drawings will also improve greatly!
I hope this was helpful to you. If I didn't explain something right or you still have questions, just let us know! :)
edited this post on September 11, 2018 5:10am.