Looking good and thanks for sharing!
keep up with the studies (eyes, hands, lips, etc. faces are tricky) and the 1 and 2 point perspective. Practice makes perfect! And explore many mediums - you never know what you will discover.
Keep it lose and build up - I learned that making it perfect from the get go always leaves little to work with for editing.
the graffiti is nice - reminds me of Wild Style
- If you're into graffiti the perspective practice will help with developing a more dynamic 3d style.
if you don't mind - I enjoy drawing as well
charcoal portrait of my girlfriend - pain in the butt!