Haha that explanation cracked me up 😅
You sculpt and model is certainly very clean and “proper” in a way. But it reads to me like you had trouble identifying and/or committing to certain facial features. Johnny’s hair (both scalp and facial) is pretty important to his appearance. Without scalp hair it’s even harder to draw the connection to him. But the facial hair is too simplified. The way his mustache curls around the corners of his lip – that’d be a good thing to emphasize.
He’s a handsome dude, so he’s potentially a more difficult candidate for caricature. You may have a more difficult time than if you’d picked Jim Carrey, for example, but I think Johnny’s features are defined enough for the task.