I'm not an expert on the Image object, but it would need to be a Serializable object to send across the network as a SOAP attachment (MIME or DIME).
If you were to send common image files, such as JPeg, GIF, PNG, etc, then you could Base64 encode the image file content and send it as XSD_BASE64. However, it would be more efficient to attach the image files as DIME attachments.
This may not be the answer you're looking for. Maybe someone else has a better idea....
thanks for your reaply.