The right arm (left from our point of view) seems very short. I think it's supposed to be going backwards, in which case the lenght would make sense, but the width of the arm doesn't give that impression, and the left arm seems too thin too. I would also like to add that the average human body is 8 heads tall, of course that varies a bit, but in this drawing the figure is a bit less than 6 heads tall, suggesting that you've either made the head too big or the torso/legs too short. There is good potential in your figure drawings though, just study proportions more!
I look forward to seeing your drawings after you've learned proportions a bit better :)