I must say its a good piece being your first time using a ballpoint pen. Definitely, it looks difficult at first but with time, it flows well. For me, what helps me to flow well with mistakes is that, i have strong believe in every mistake to be a design. You can actually turn your mistakes into design in art. Most times that i choose to use pencil or even S-Pen, i avoid to use erasers because i strongly believe it helps in getting faster and accurate in drawing. You did really well with the sketches. ❤️