I would suggest focusing on fundamentals just as proportions before jumping into a stylized look. Once you have the basics down packed its a lot easier to exaggerate proportions properly. Check out the Loomis books with reference to proportions and try and match those; also Anatomy for Sculptors like @bkost mentioned. Good…
It's critical to understand the foundation to any sort of 'character' modelling before stemming off into unique styling (LoL and Overwatch are great examples). So with that in mind, if you wish to create stylized characters learn ideal anatomy and proportions first. Once you have a grasp on this, then you may continue to…