Really nice character you have here. I think you nailed it when it comes to his personality coming through not just through the expression on his face, but his body language as well as which proportions you chose to exaggerate really bring out the shy and awkwardness. His clothing also compliments his character very well. I would like to see his whole body though, its always best to do full body shots when doing general characters if you can help it. I really like the hatching, it is well placed and keeps it looking clean while adding a really good amount of depth. I think the hatching would compliment some very basic coloring in the future, nothing too crazy just single tones and maybe some highlight tones.
The left side looks like it has a bit too much empty space, maybe consider cropping it just a little to strengthen the focus, but it isn't a huge deal.
Great work on this, keep it up!