Nice job on your female nude attitude, Hayunb. That's very light and fluid in the lines.
I've got one small suggestion. I love the gesture and forces going on here, but I must see more solid spaces and forms here in her construction of her body. Would you like to warm-up with a 2 minute pose, all flipped vertically?
The reason why you could and should do this improvement is because, it can and shall help you out on observing your edges and spaces, also it can make it a whole lot of fun with figure drawing.
In Google Chrome, make two tabs: 1 for your studio, and the 2nd, the drawing session; all arranged in a group of tabs.
Good luck and my hat's off to you.
Thank you very for the suggestions.
Nice!! i really like the line