I don't think Harry goes out of his way to interact, but he would wave at her in the streets or stop and talk to her if they're at the same place. The disaster of the Yule Ball is probably still in his mind, but mostly forgotten.
I think Harry would hate having his picture taken, but he may do it for her once.
Georgie! Harry likes you. A lot. BFFS.
FLEUR. FEED HIM. MAKE HIM FAT ON HEAVY FRENCH FOOD.