one model for several viewings

[someralex]

I have figured everything out! Thanks so much.
I just read it through, studied the code, read the assistent and got it all clear.
I have done the following methods:

QModelIndex myModel::addFolder(const QDir &foldername){
  int row = rowCount(); // number of folders already in the model
  insertRow(row); // add a new row
  QModelIndex ind = index(row, 0); // index of the newly created item
  insertColumn(0, ind); // add a column for future children of the item
  setData(ind, foldername.dirName(), Qt::DisplayRole);
  return ind;
}
 
QModelIndex myModel::addFile(const QModelIndex &parent, const QFileInfo &file){
  int row = rowCount(parent); // get number of files
  insertRow(row, parent); // insert new file
  QModelIndex ind = index(row, 0, parent); // get index
  setData(ind, file.completeBaseName(), Qt::DisplayRole); // insert filename in
  setData(ind, file.absoluteFilePath(), Qt::UserRole); // insert full path in Qt
  return ind;
}
QModelIndex myModel::addImage(const QModelIndex &parent, const QPixmap &image){
  setData(parent, image, Qt::UserRole+1);
  return parent;
}

QModelIndex myModel::addFolder(const QDir &foldername){
  int row = rowCount(); // number of folders already in the model
  insertRow(row); // add a new row
  QModelIndex ind = index(row, 0); // index of the newly created item
  insertColumn(0, ind); // add a column for future children of the item
  setData(ind, foldername.dirName(), Qt::DisplayRole);
  return ind;
}

QModelIndex myModel::addFile(const QModelIndex &parent, const QFileInfo &file){
  int row = rowCount(parent); // get number of files
  insertRow(row, parent); // insert new file
  QModelIndex ind = index(row, 0, parent); // get index
  setData(ind, file.completeBaseName(), Qt::DisplayRole); // insert filename in
  setData(ind, file.absoluteFilePath(), Qt::UserRole); // insert full path in Qt
  return ind;
}
QModelIndex myModel::addImage(const QModelIndex &parent, const QPixmap &image){
  setData(parent, image, Qt::UserRole+1);
  return parent;
}

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void MainWindow::changeItemInLV2(const QModelIndex &myIndex){
     imageLabel->setText(myIndex.sibling(myIndex.row(),0).data(Qt::UserRole).toString());
}

void MainWindow::changeItemInLV2(const QModelIndex &myIndex){
     imageLabel->setText(myIndex.sibling(myIndex.row(),0).data(Qt::UserRole).toString());
}

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And how to create a method to get an image from Qt::UserRole+1 I can't understand.
QVariant doesn't have toPixmap method.
I'm asking for your help. again.