The Cheek Color is very pigmented and Strawberry Pink is a bright, youthful shade that does indeed resemble the dainty pink cheeks of a porcelain doll. The powder is mostly matte but has a subtle shine when blended into the skin. It is also very soft and feels very light. I am not sure if Strawberry Pink is a work-appropriate shade but it is definitely not the right shade of blush for women of a certain age. (The new blush, Peach Pink, is much friendlier.)
The Marshmallow Purple Highlight has a dash of shimmer and a creamy texture. When used over or mixed with the Strawberry Pink blush, it softens the pink shade and gives the cheeks a pearly air-brushed and doll-like quality. The differences between Strawberry Pink with the highlighter and without Marshmallow Purple are very subtle, however. But I do think you should consider purchasing the highlighter if you decide to get your hands on Strawberry Pink. Alone, I think Marshmallow Purple is too subtle to work well as a highlighter and only recommend it if you plan to mix it with a blush.
I did take some photos of swatches but they do not capture just how pigmented and bright Strawberry Pink is. The swatch on the top is Strawberry Pink with Marshmallow Purple and the swatch on the bottom is just Strawberry Pink. I think the photo of Tsubasa wearing the blush on the Candy Doll website is a very accurate representation of what the cheek color looks like on the face. Both the Cheek Color and the Highlight Marshmallow Purple are 1,260 yen each (including tax).