Disclaimer: These pictures are for learning use only.
To crop the photo the cropping tool was used in Photoshop and then fitted to fit the original size.
To remove the wrinkles the Spot Healing Tool was used on Adobe Photoshop.
Links for the original photos altered in the above photo: http://www.pixelstalk.net/download-great-pumpkin-charlie-brown-backgrounds-free/ http://cdn2.locable.com/uploads/resource/file/291784/charlie-brown-320.jpg
To whiten the teeth in the above photo, the quick selection and then Hue and Saturation tool were used to brighten the teeth.