I don't see any major grammatical errors there. I think the underlined portions are not OK. The embroidery design on the cushion cover to be reduced in size of 7 cm and to be on the center of the cushion cover, not on the corners.
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AnonymousThe embroidery design on the cushion cover to be reduced in size of 7 cm and to be on the center of the cushion cover, not on the corners."reduced in size of 7 cm" is incorrect and the meaning is unclear. Possibly it is trying to say that the design should be reduced to 7 cm (i.e. the desired size is 7 cm).