not too bad
It's good. Your art is okay.
Not sure what you mean by the circle method you came up with. There are lots of books showing you how to break down the body into basic shapes in order to simplify drawing. It's a smart approach, but not a new concept.
Your hands really need work. You make the main part of the hand too short. If you straighten your thumb alongside your hand, your knuckles start at nearly the same level as the tip of your thumb. The first knuckes (each row of knuckles, in fact) should follow a curve sweeping at the end of the hand, not be level with each other.
You could have got more detailed with the tutorial. The file size is still relatively small. Going into facial and body proportioning would be useful.