XML doesn't support images. You have to store image as Base64 in XML.
This[
^] might help you.
Dim img As Image
Dim stream As New IO.MemoryStream()
Dim result As String
img =
img.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg)
result = Convert.ToBase64String(stream.ToArray)
and reverse to retrieve the image.