How to draw a thick arrow in picturebox in vb.net

[polas]

Hello I have here a problem with drawing on the picture.
Draw a picture on well but it's drawing a thin line and I need a thicker thickness of at least 4.5.

But I'd like to draw arrow and not line.

Need a simple arrows with no gradient and a much smaller and thinner.
Approximately 4.5 thickness used on the image.

I need normal arrow like in the picture i want to draw arrow anywhere on the image in the picturebox inside like in the paint.

Or make a bold line of the same code which I gave.
I'new for graphics so do not ask to me how ?

Here's an example of what I need.





how do i do that ?


So far, I have only this code.
Here is the code:

  Private Sub PictureBox1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove
        If _Previous IsNot Nothing Then
            If PictureBox1.Image Is Nothing Then
                Dim bmp As New Bitmap(PictureBox1.Width, PictureBox1.Height)
                Using g As Graphics = Graphics.FromImage(bmp)
                    g.Clear(Color.White)
                End Using
                PictureBox1.Image = bmp
            End If
            Using g As Graphics = Graphics.FromImage(PictureBox1.Image)
                g.DrawLine(Pens.Red, _Previous.Value, e.Location)
            End Using
            PictureBox1.Invalidate()
            _Previous = e.Location
        End If
    End Sub
 
    Private _Previous As System.Nullable(Of Point) = Nothing
    Private Sub pictureBox1_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) Handles PictureBox1.MouseDown
        _Previous = e.Location
        PictureBox1_MouseMove(sender, e)
    End Sub

Private Sub PictureBox1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseUp
        _Previous = Nothing
    End Sub

Any help would benefit me.