Llamando imágenes con OPENFILEDIALOG 

Importar:

Load:

OpenFileDialog1.Filter = "Todos(*.Jpg, *.Png, *.Gif, *.Tiff, *.Jpeg, *.Bmp)|*.Jpg; *.Png; *.Gif; *.Tiff; *.Jpeg; *.Bmp"

Examinar:

Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click

        OpenFileDialog1.ShowDialog()

        Label7.Text = OpenFileDialog1.FileName.ToString

        PictureBox1.Image = System.Drawing.Image.FromFile(Label7.Text)

    End Sub

Listo ya puedes traer imágenes al picturebox. Saludos!