What happened to Hierophant Green's painting power?
Because he never had such an ability.
The painting was just a prop. As soon as Kakyoin stroke the canvas, he had Hierophant cut Jotaro. While this is not stated, it's heavily implied because as soon as he painted Jotaro, he threw the painting into a tree, signifying its unimportance, instead of using it again when he confronted Jotaro.