My sister did this nail art work for me! It was just a tester for her. I've bought the flower stickers for ages but not got a chance to use them. I'm not a huge fans on doing nail artwork, I say my sister is better at it.
The product we use are Nails Inc. They are many colours to choose from and it is really easy to remove. However, they don't really last long so I suggest to add an invisible coat over it.