prueba este código:
'Print the Picture contained in a PictureBox or a Form
Public Sub PrintImage(p As IPictureDisp, Optional ByVal x, Optional ByVal y, Optional ByVal resize)
If IsMissing(x) Then x = Printer.CurrentX
If IsMissing(y) Then y = Printer.CurrentY
If IsMissing(resize) Then resize = 1
Printer.PaintPicture p, x, y, p.Width * resize, p.Height * resize
End Sub
'
' FORMULARIO
'
Private Sub Command1_Click()
'Print the image loaded in Picture1 (real size)
PrintImage Picture1.Picture
'Print the image loaded in Picture1 (half size)
PrintImage Picture1.Picture, , , 0.5
End Sub