your program crashes, because you should write
Qt Code: 
  1. QString imgFile = QSqlTableModel::data(idx, Qt::DisplayRole);
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instead of
Qt Code: 
  1. QString imgFile = idx.data().toString();
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try to exactly repeat my previous code...
Qt Code: 
  1. QVariant PersonasModel::data(const QModelIndex &idx, int role) const
  2. {
  3.     if ( idx.column() == 5 )
  4.     {
  5.         QString imgFile = QSqlTableModel::data( idx, Qt::DisplayRole );
  6.         if ( Qt::DisplayRole == role )
  7.         {
  8.             return QString();
  9.         }
  10.         if ( !QFile::exists( imgFile )
  11.         {
  12.             imgFile = ":/centinela/images/picture_unavailable.jpg";
  13.         }
  14.         QPixmap pixmap( imgFile );
  15.         if ( role == Qt::DecorationRole )
  16.         {
  17.             return pixmap;
  18.         }
  19.         if(role == Qt::SizeHintRole)
  20.         {
  21.             return pixmap.size();
  22.         }
  23.     }
  24.     return QSqlTableModel::data( idx, role );
  25. }
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should I call QTableView::resizeRowsToContents() ?
honestly, I don't know. try ...