Studies - Drawing Style 01

I love this manga! You replicated the characters perfectly!  The poses are spot on! The angles are great! Don't practice grey scale from B&W images though. The shading system is slightly different when dealing with comics. This is because both light and form in manga is, largely, represented in manga as positive and negative space.  Also distance and space is represented through weighted lines.  In more complex styles that use greater ranges of value, light is represented through the use of graduated shades. Firm is also determined through light and shadow as opposed to positive and negative space.  If you do practice grey-scale from a manga  image then try determining your own light source and using graduated shades based off of that.  Your current style of shading is very reminiscent of watercolor  which looks great! but of yo were going for anything different then you may want to consider   studying from life as a basis for shading in manga. There is something else I'd like to point out. You never went completely black anywhere on your image. A lot of artists, myself included, make the mistake of using black and that just gives the picture a very 2-D feel. The fact that you didn't actually helps the eye see the angle-perspective better because it is notdrawn to the black, but to the drawing as a whole. Very good job at that! Keep up the awesome work!