Add sprite to your scene(.cpp)

HelloWorldScene.cpp

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !CCLayer::init() )
    {
        return false;
    }

    CCSize size = CCDirector::sharedDirector()->getWinSize();

    this->charlie = CCSprite::create("Charlie.png");

    // position the sprite on the center of the screen
    this->charlie->setPosition( ccp(size.width/2, size.height/2) );

    // add the sprite as a child to this layer
    this->addChild(pSprite, 0);

    return true;
}