oh sorry i just opened this lol, but im really glad you enjoy my art ☺️ honestly its just years of drawing those lil guidelines they teach you on youtube and or art class all over again and again, also a shit ton of body and real life references! Dont be afraid to use real life references to your drawing, doesn't matter if you're going for a cartoonish or anime style ^^ same goes for shadows, always know your light source when planning your drawing (try imagining it like its a small lil sun/moon in your drawing) many youtube vids can teach you how you do that >:) For color I'm still learning on how to do it (as you can see from my other works they're all different lol) but I suggest you learn the different warm and cool color and how you use it in the environment of your drawing (if they're in a warm and sunny environment use warm colors, if cold and dark environment use cool colors) you can also contrast the two by putting cool colors on warm colors and vice versa (on the darker shadows of yoyr drawing), uhh that's all I could probably give you I'm not an expert on it since I'm still learning myself but I hope this helps you just a lil ^^ good luck!