Create a close-up image of a decadent blueberry roll cake. The cake should feature a creamy white and yellow swirl, with a rich layer of blueberry filling. The outside is moist and soft, drizzled with a glossy blueberry syrup that glistens in the light. Fresh, plump blueberries are scattered on top and around the plate for garnish, along with a few vibrant green mint leaves to add contrast. The colors should pop--deep purples from the blueberries, soft creamy whites, and golden cake. The overall look should be inviting and indulgent, with textures of smooth cream and juicy berries