I drew this for my friend but every time I look at it it gets worse and worse should I keep it or should I start again?

If there's anything I've learned from doing art it's, if you don't like something, start over. Sometimes it's painful to do, especially if you've worked on something for a long time. If I don't like something it always bothers me, and I lose value in the piece. I personally think it looks great! But, if you don't like it, just start over, nothing is worse than a piece you feel to be unfinished.