I promised to teach my friend to draw, but I'm not very skilled. Please write me a short message.

I may have promised you in a hurry, but when I came back, I felt that I was not very skilled. I'm really sorry. I hope I can get your forgiveness. I'm deeply sorry. I went back, but on the way ... here, I will continue to apologize to you until you are not angry with me again, until you regard me as your friend again.

Remember: be sincere and persist.