Hand Painted Golden Grape Leather Handbag

This bag's color itself is yellow, with golden grapes and orange grape leaf pattern, looks very harmonious.
After getting this bag, I didn't know how to painting on there.One day, an inspiration is coming into my mind, finished it quickly.

A friend saw this bag while coming home, she liked it very much, so it became her new bag.
When she back home, no one of her family discovered that bag is hand-painted.
She told me about this, I 'm proud of myself and puzzled.
Whether should I left hand trace while drawing later?