One of the basic skills in art is anatomy. Although it sometimes may seem as if an artist doesn't bother about the anatomical corectness of their characters (cartoons, anime, caricature), you can be sure that they know perfectly well how to draw it if they had to: Know the rules, so you can break them all the better.
Unfortunately that's much, much easier said than done: Learning anatomy is bloody hard. It takes time and dedication to learn just the basics, and even established artists often struggle with it. Luckily many people have gone before us, and some of them have been kind enough to make tutorials, to hopefully make it just a tin
You have a really incredible gallery! The amount of time you spend on each piece really shines through in the control on your lines as well as the finite detail in every line made Truly talented AND hard working