The designer one appears to be square while the shop image tries to fit in a rectangular area and seems to be a bit distorted. Assuming that the shop image is a separate entity, try uploading a rectangular section of the original image for that purpose. Or is size difference and distortion not what you see ?
Yes, the shop header image is different from designer portfolio head image. The shop one requires a rectangular of 220 x 165 px image. Yes, you're right. However, I'm tired of shapeways changing image size requirement from time to time. Why can't it be the same head image thru all the places ?