Add width, height and others attribute for image and link

echo CHtml::link(CHtml::image(Yii::app()->baseUrl."/uploads/promotion/".$promotion->image,$promotion->description,array('class'=>'promotion', 'title'=>$promotion->description)), "$promotion->url", array('target'=>'_self','class'=>'promotion'));



echo CHtml::image(Yii::app()->request->baseUrl.'/img/image.png',
      'this is alt tag of image',
      array('width'=>'100px','height'=>'100px','title'=>'image title here'));