Need a good gift for a friend who surprised me y'day?

am used to eating in a particuar restaturant in India. There is a painting which I like very much I fell in love with the painting as it so much resembled my sister and me - I Always wanted to get some thing like that and to make another one was not that simple - I requested the owner of the restaurant if he could give me copy of the same - But he said that it was not possible - He took a photo of the painitng an emailed the same to me for which I was so happy .After a gap of 1month my daughter and me went to the restaurant last night.hey had changed the pictures and the one I loved was missing Asked the waiter and he said that the owner has taken it - felt sad -. AS we almost finished eating - the owner comes to my table with the huge packing and said surprise and gifted the pic- Words can't describe how happy I was - I was just grinning from ear to ear - He refused to take any money and it must cost at least 100$.Any ideas what to give him as my gift please.Please note am in India