Although the style is... different, the quality looked decent -until I enlarged the image. You could use some blending tips.
Use your finger, the sharp end of a rolled up piece of paper, a Q-tip, a make-up sponge applicator, etc... I can't really tell you exactly how to blend, so just shade a bit on a new piece of paper and try some things out to see what suits you best. Sometimes small things such as the paper point are more suitable to use in cramped areas, where the Q-tip is best used for a larger, less detailed space. Also, place a piece of scrap paper bewteen your drawing hand and your drawing, as the graphite (or charcoal) tends to smudge.
If you have any more questions or want me to elaborate on anything, hit me up.
