the problem is that you're thinking in symbols, rather than what should actually be there. what's
between the symbols is as important as the symbols themselves. it's easy to remember that faces have eyes and heads have hair, but if you don't have a firm basis in anatomy (and aren't using references), then perhaps you make a mistake like the one here, which is omitting the brow and forehead entirely. you know of course that heads have ears, and that they are on the sides of the head- but where exactly on the side? how high or low? how large are they in relation to the surrounding features, what other features of the face should the line up with?
even if you're making it 'cartoony', it still needs underlying anatomy.
for it to look like you know what you're doing, what you make should be an abstraction from actual anatomy. omitting all anatomy (like a cranium, or giving him noodle arms) makes it look as if you don't know what should be there.
I could critique the anatomy, but tbh everything needs work. so use references when making art, and study those references. check relative sizes and locations of features, know the underlying anatomy (both the muscular and skeletal system). If you don't learn what's actually there, and trust your eyes in depicting it, then you'll default to relying on your brain, which stores a bunch of convenient symbols that don't necessarily form an accurate representation when cobbled together.
