I would suggest using the Repository Access (RA) library instead of the older LFSO library.  Here is a code snippet to delete a single page (image) in a document using RA;

        'Best practice to wrap the code in a Try/Catch block just in case there is an error thrown...
        Try

            'Using RA start with a RepositoryRegistration object.  
            'First parameter is the LF servername, second parameter is the repository name...
            Dim myRegistration As New RepositoryRegistration("localhost", "LFMAIN")
            Dim mySession As New Session

            'With the session object call the login method with the UserID, password, and registration object.
            'NOTE: To use Windows Authentication to login to LF use this syntax: mySession.Login(myRegistration)
            mySession.LogIn("admin", "admin", myRegistration)

            'Instantiate a DocumentInfo object with the entryID of the document to work with...
            Dim docInfo As DocumentInfo = Document.GetDocumentInfo(92732, mySession)

            'Lock the DocumentInfo object in preparation for deleting a page...
            docInfo.Lock(LockType.Exclusive)

            'Delete the page...
            'NOTE: The DeletePage method will accept a single page number to delete or a PageSet to delete if you want to 
            'delete a series of pages with a single call...
            'NOTE: The pagenumber in RA is not 0 based but is 1 based, so delete page 1...
            docInfo.DeletePage(1)

            'Unlock the DocumentInfo object...
            docInfo.Unlock()

            'Cleanup...
            docInfo.Dispose()
            mySession.Close()
            mySession = Nothing
            myRegistration = Nothing

        Catch ex As Exception
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK)

        End Try

Let me know if that answers your question...