It depends on what the painting is. Is it watercolor or something? Because I want to express it in English, I think it is better to stick a beautiful little card in a corner of the picture, depending on the layout of the text. Master it yourself! ! As for how to write greetings and signatures, shall I write my own version for you?

Love+Mom or Lucy:

On your birthday, please accept my three wishes: May you be healthy, may your dreams come true, and may your life be full of happiness and joy. On your birthday, I sincerely offer my three wishes: I wish you good health, I wish your dreams come true and I wish you happiness. )

Best wishes for a happy birthday! !

Your friends or sisters,

Fatamy

Some content depends on your situation! ! ! May your blessing be delivered! !