I love your finished product! I recommend, however, definitely giving each line a purpose, like you pointed out already. Especially on the dress, make sure the lines are intentional for your folds and make sense, rather than just random lines.
A pretty girl
Artist's notes:
This pencil drawing was done in 2020. At the time, I was in high school and couldn't draw as well as I do now. I've always been self-taught, but I still struggle with some things. A clear example is the difficulty of drawing clean lines and slightly more three-dimensional shapes. However, I'm learning gradually.