Dear Ricky:
Thank you for sending me the photos and the English reading materials.照片如果是她本人的则恭维：You look so pretty and I really like the photos.如果是自然风光：The scenery is so beautiful.I hope someday I would have a chance to take a visit.The reading materials are very helpful to improve my English.It takes time to read all of them.I will let you know what I feel after I finish it.
I am very appreciative of your help.
Sincerely.
xxx(名,对方以名称呼,则以名签字,以示对等）