I think you did really well on the hair.
What could be improved first and foremost here, I think, is the sharpness. You've got a great focus on the hair and face but on the body it's like you lost interest. If you go back and finish it up, give more refinition and blending I'm sure it would look even better.
You're absolutely right, I was getting kinda frustrated and I still have no control over my impatience. I am struggling to slow down and really pay attention to detail but on this pic the entire time I felt like it looked weird lol I wasn't sure if it was just a practice scrap or something to really devote myself to, so I guess it shows lol