Why do you think Cherly Cole always has a face like a smacked ar*se?

Even in her music videos and on XFactor she rarely smiles or looks cheerful, this may wash in the UK but in the US I don't think it will help her career, the artists over there are very chirpy smiley happy looking peeps, esp in music vids. I don't mind Cheryl Cole but it does annoy me that she always looks dull and depressed. not really a good way to be if on TV.