Wouldyoulikemetakingapictureofyou?祈使句的引导词有很多,根据你的“对一个陌生人”的提示,“Wouldyoulike"是征求别人的意见的首选,很委婉。
May/CanItakeaphotoofyou?我能给你拍张照片吗?May/CanItakeaphotowithyou?我能和你拍张照片吗?