Thank you for your interest in improving the color appearance of your 2 front teeth! From your description and the pictures, I am not able to 100% determine the cause of your tooth color appearance concern. It would be great to have some additional information. From what I can see, I suspect...
Sorry to say, but no procedure is available yet to paint the teeth. I have tried it before and not had success. It is a great idea, but no product exists at this time.
It looks as if you bleached your teeth and the tray or strip did not go all the way to the gum line. Unfortunately the photo is not super clear so that is all I can comment on now.