Nice progress. I love the astro boy movie and it's one of my son's favorites. A few things that are really noticeable to me are the shape of the eyes, location of the ears, thickness of the eyebrows and overall shape of the head.

The eyes are not rounded enough. Right now, they are very pinched in at the inside corners making him look somewhat asian. The ears are a bit too high. The top of the ears should almost be down to the bottom of the eyes. The eyebrows look pretty good but I think they might look better if you could make them a little thinner. As far as the overall shape of the head, it doesn't seem rounded enough, especially above the ears.

You've made some really awesome progress on the model so I'm sure making changes like this would NOT be easy at all. But if you do plan on adjusting anything, I hope this will help you out some.

I think your model is looking good has some good potential. Keep at it!