How to Serailize Object to Array Json C#

Hi Experts ,

Am trying to serailize a dynamic object to array . but its not working correctly and here is my code

dynamic product = new JObject();
 foreach (PropertyImage tbl in LST)
                {

                    product.FullImage = SiteUrl + "/" + tbl.Photo;
                    product.imageThumb = SiteUrl + "/" + tbl.Photo;
                    product.description = tbl.Tag;
                    product.Address = Address;
                    product.imageid = tbl.OrderNumber;
                    product.TextColor = "White";

                    if (Photos != "")
                    {
                        Photos += "," + product.ToString();
                    }
                    else
                    {
                        
                        Photos += product.ToString();
                    }
                }
                //Json += Photos;
                // Json += "]";

                var json = JsonConvert.SerializeObject(Photos, Formatting.Indented); ;

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but am getting json  output as

"{\r\n  \"FullImage\": \"http://localhost:57226/img/image1.JPG\",\r\n  \"imageThumb\": \"http://localhost
:57226/img/image1.JPG\",\r\n  \"description\": \"Kitchen\",\r\n  \"Address\": \"Test\",\r\n  \"imageid
\": 1,\r\n  \"TextColor\": \"White\"\r\n},{\r\n  \"FullImage\": \"http://localhost:57226/img/image1.JPG
\",\r\n  \"imageThumb\": \"http://localhost:57226/img/image1.JPG\",\r\n  \"description\": \"Bedroom\"
,\r\n  \"Address\": \"Test\",\r\n  \"imageid\": 1,\r\n  \"TextColor\": \"White\"\r\n}"

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