Is it safe tht Yesstyle(Online Shop) asking for card image or statement for verification?

Oh it is safe because they just want to confirm the identity of the customer to prevent fraud purchase. In fact, I find their practice reasonable especially when the order amount is huge. I once asked their customer service and they replied that they only require these images if you are a first time customer. When they have confirmed that you are the card holder, you will not need to provide any documents later.