Hello and thank you! C:
I’m just going to throw some links to tutorials here at you because it’s easier than explaining on my own, haha.
Female Body Tutorial (note that the same can be applied to male characters with a few modifications - e.g. the bust/waist/hips/thighs can be modified to shoulders/chest (ribcage)/thighs for male characters, and can be expanded to include neck, shoulders, arms (both upper and lower), and calves for both sexes - all can have varying sizes in any given character, which is what creates a unique silhouette)
Skin: A Chart (note that this is a supplement to a tutorial on how to paint skin, linked in the description to the image)
Younger vs. Older features (a non-realism view on how to make characters look younger by reducing facial detail - not applicable to all styles and character designs but it can be a helpful thing to keep in mind)
Guide to Aging Characters
…I get the feeling I’m forgetting to link something (and for the life of me I couldn’t find anything good on how to draw fatter characters), but there’s the basics I can remember.