class Model : public QAbstractTableModel {

    int rowCount(const QModelIndex &parent = QModelIndex()) const override {
        return 1;
    }
    int columnCount(const QModelIndex &parent = QModelIndex()) const override {
        return 2;
    }

    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override {
        if( role == Qt::DecorationRole ) {
            QIcon icon = QApplication::desktop()->style()->standardIcon( QStyle::SP_DialogApplyButton );

            switch( index.column() ) {
            case 0:
                return icon;
            case 1:
                return icon.pixmap(QSize(16, 16));
            }
        }

        return QVariant();
    }
};

    ui->tableView->setIconSize(QSize(16, 16));
    ui->tableView->setModel(new Model());