You combined BOF4 (Fou-Lu sword, part of dragon, clothing) with BOF5 (other part of dragon, Ryu's hair) I guess the drawing itself isn't that bad, the Dragon could look a whole lot better though. But I suggest that if you try to create your own Ryu-like person, add some more originality to it.
Not really if you have a good mouse, use small strokes and keep you left hand on Ctrl+Z if you make a mistake...
You still seem to have small proportion issues, especially on the lenght of the hand. Just stretch your arm straight down and see where it reaches. Sasukes right arm reaches to his hips, normal person can reach somewhere around his thights.
Good thing you remembered Sasuke uses Chidori with his left hand.