Improve drawing? Your ideas?

The drawing should later be his Twitch Emoji, therefore zoomed out that far.

I'm satisfied with the shape, but I don't like the hair that much, what tips do you have for me?

Thanks in advance.

Possibly incorporate shade. Normally, hair is not only 1-colored, there are lighter and darker areas

You don't need shadows with a Twitch Emoji, but I'll try to use a bit darker colors, thank you.