Here is what the dragon sketch comes out looking like after you have added the shading, highlighting, detailing. If you are not sure what type of shading needs to be done, just look at the finished sketch and shade in the areas that are shaded in here. I know you did a great job, and if your dragon sketch didn't turn out good enough for you, try it again until it does. Remember gang, practice makes perfect. There is no such thing as an overnight artist.