Extracting images from nvarchar(max) column in SQL 2008

-- Image Export Stored Procedure
Alter PROCEDURE dbo.usp_ExportImage 
( @id int
)
AS
BEGIN
   DECLARE @ImageData varbinary(max);
   DECLARE @Path2OutFile NVARCHAR (2000);
   DECLARE @Obj INT;
   Declare @File varchar(100);
 
   SET NOCOUNT ON
 
   SELECT @ImageData = (SELECT --picVarBinary 
          cast(PictureData as VARBINARY (max))
         FROM Pictures
         WHERE id = @id 
         );

	     SELECT @File = picfilename
         FROM Pictures
         WHERE id = @id 
      
   SET @Path2OutFile = CONCAT (
         --'\\AW-FOS-SQL1-UT\New_folder'
		 'G:\SM_RS'
		,'\'
         , @File
         );
	print @path2outFile
    BEGIN TRY
     EXEC sp_OACreate 'ADODB.Stream' ,@Obj OUTPUT;
     EXEC sp_OASetProperty @Obj ,'Type',1;
     EXEC sp_OAMethod @Obj,'Open';
     EXEC sp_OAMethod @Obj,'Write', NULL, @ImageData;
     EXEC sp_OAMethod @Obj,'SaveToFile', NULL, @Path2OutFile, 2;
     EXEC sp_OAMethod @Obj,'Close';
     EXEC sp_OADestroy @Obj;
    END TRY
    
 BEGIN CATCH
  EXEC sp_OADestroy @Obj;
 END CATCH
 
   SET NOCOUNT OFF
END
GO

I have SQL Server 2008 images saved in nvarchar(max) column. I am trying to get the image using OLA objects and I am getting image back as well. But When I am trying to open any image, it is saying invalid format.

If anyone can help in that?