How to Display a "*.png" file on a UI in QT framework?

I am new to Qt Framework...

I want to display a .png pic in my Form1.ui , so I dragged and dropped a Graphic view from the widget box then I placed test.png in the same directory (inside the project folder)

and i did this in the code

//Form1.cpp
#include "form1.h"
#include "ui_form1.h"

Form1::Form1(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Form1)
{
    ui->setupUi(this);
    ui->Pic1->setStyleSheet("background-image: url(test.png)");

}

Form1::~Form1()
{
    delete ui;
}



//Form1.h
#ifndef FORM1_H
#define FORM1_H

#include <QWidget>

namespace Ui {
    class Form1;
}

class Form1 : public QWidget
{
    Q_OBJECT

public:
    explicit Form1(QWidget *parent = 0);
    ~Form1();

private:
    Ui::Form1 *ui;
};

#endif // FORM1_H

It compiled perfectly but the pic didn't appear , What did I Wrong ?

this is my qrc :