problem with assigning the downloadloded image to label

[kwisp]

first of all, why do you connect signal(void sendimage(QImage)) and slot(void getimage(const QImage &image)) which have different parametrs QImage!=const QImage&.

Can you make test?

void Tweet::getimage(const QImage &image)
{
   if(image.isNull()) return;
   QPixmap pix(QPixmap::fromImage(image));
   if(pix.isNull()) {
      qDebug()<<"bad image";
      return;
   }
   m_ui->userImage->setPixmap();
   QMessageBox::information(0,"",QString("image got from download"));
}

void Tweet::getimage(const QImage &image)
{
   if(image.isNull()) return;
   QPixmap pix(QPixmap::fromImage(image));
   if(pix.isNull()) {
      qDebug()<<"bad image";
      return;
   }
   m_ui->userImage->setPixmap();
   QMessageBox::information(0,"",QString("image got from download"));
}

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second.

image = new QImage();

image = new QImage();

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where are you return memory back?