figure skater

Thanks for sharing! 
It's great you're doing studies like that, however I can see it took you a lot of time to finish this one (maybe 10 or more minutes?), and you captured a lot of details (dress, skates, hair, detailed face), but there still are problems with proportions and anatomy. The thing with it is that these details would look better on a figure with good proportions and form, right? 
You'd benefit a lot from doing shorter gesture drawings (30-60 seconds). The point of shorter drawings is to learn to capture only the most important parts of a human figure, without having time to delve into unnecessary details. Also I'd highly recommed watching how masters do short gesture drawings, to learn (Glenn Vilppu is great)
Keep on drawing, it's awesome!

The hair is drawn very well, but the orientation of the limbs is not adequately represented. The wrist and arm of the hand that is closer to the front are not distinguished (the contrast in thickness also suggests structural relationships). Instead of copying the photo exactly, it would be better to use the photo as a reference and incorporate your own subjective refinement (aesthetics, technique, expression, focus) in your drawing.头发画得很好，但四肢的方向没有充分表现出来。靠近前方的手腕和手臂无法区分（厚度的对比也表明了结构关系）。与其完全照搬照片，不如将照片作为参考，并在你的绘画中融入你自己的主观提炼（美学、技术、表达、焦点）。

阴影的描绘非常出色。请注意一下脚部的透视。人物的左脚似乎比右脚长一些。

Saw some other people’s comments and i agree that the shading and anatomical details are good but they are laying on the wrong foundation. As someone else said, faster sessions more focused on the big picture would help, but another way to help would be by learning how to measure the form with your eyes. Like, learning how to copy a picture well (specifically the relationship between one line and another: the angle and distance between them). That will help with some wonky proportions that are usually hard to name.