I don't think that vest is enough for him. Lets go ahead and add in a nice shirt for our chibi boy. When doing the sleeves of the shirt, make sure you keep them long. Short sleeves are girl shirt styles and long sleeves are mens shirt styles. While you're at it, go ahead and add in his three little buttons. Now, when doing the eyebrows, make sure you keep them -thick-! Thin eyebrows are female and thick eyebrows are very masculine. Even though you can't see them very well because of his hair style, go ahead and draw them peeking through his bangs.