He looks bald because you don’t have a hair looking texture on his actual scalp too. I recommend replacing his bald head texture with a matching hair texture. Also his head hair color is blond and his side burns are brunet. I don’t know if it’s suppose to look like his hair color is blond or if he died the top of his head blond. But yea if you replace the bald texture on his head with blond hair texture it will blend in with the actual hair and it will give it a realistic elusion.
Hopes this helps!