其英文定義為：
A flagship is the lead ship in a fleet of vessels, a designation given on account of being either the largest, fastest, newest, most heavily armed or, for publicity purposes, the best known. In military terms, it is a ship used by the commanding officer of a group of naval ships.
後延伸為商業定義：
Flagship stores, or simply flagships, are main stores from retailers designed to serve a mainstream of customers.
最新壹則新聞：
Apple Adds 2nd Flagship Shop in China
所以， 無論是Flagship stores, Flagship shop 還是Flagships (嚴重推薦）都是可以的，至於ship-flag shops,還是忘了吧
image shops 感覺像是國內人給旗艦店的壹個姊妹稱號。 在國外妳如果說image shops，只是指提供形象設計和圖像處理的服務（custom image editing & Photoshop tutorials），所經營的產品也和攝影攝像有關。所以，image shop 在國內外的定義上是有很大差距的。
先說這麽多吧
Good Luck and ALl the best.