long hair is also heavier.
to help with the anime style,-- anime is honestly one of the more accurate versions of a realistic yet simplified human body, just work on realistic proportions and then simplify from there. Simplification is voiding details whilst keeping an understandable shape. that's why noses are often dots or lines. eyes are larger to be more expressive, mouths are a line with the occasional shadow of a bottom lip. at the end of the day, your style is something you work to create, it's your choice what you simplify or detail.
i also recommend working on line confidence and thinking of what it'll add to a piece. For example, on the last photo, the girl in the beanie, the small lines in the hair make it look a bit like wrinkled fabric, you're better off either making the lines go down the length fully, or not at all.