All Pikachu cards of this version look like this, this is a red cheeked pikachu but it also comes in yellow cheeks depending on your preference. I have both of them.
No, they don't all look like that. Yes, there is the red cheek/yellow cheek difference and shadowed or shadowless. This pic is shadowless, meaning there is now shadow from the right side of the square inside the card around the Pokemon's picture. With a shadowed one there would be a shadow. Also, is it first edition or not? It would have little black circle with a (1st) symbol inside it on the bottom left corner of the Pokemon's pic.