How about these few Riddles??

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I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes, So tell me what I must be. And..... A skin have I, more eyes than one. I can be very nice when I am done. What am I? And..... Big as a biscuit deep as a cup, Even a river can’t fill it up. What is it? I thought they were cute! Can you figure them out??