Hi Malachy,
Thank You for using Syncfusion Essential XlsIO. You can move the picture to another location by using the following code snippet.
[c#]
//Insert Image
sheet.Pictures.AddPicture(1,1,"../../Data/excel_ico.gif");
//Reposition Image
sheet.Pictures[0].Left = 200;
sheet.Pictures[0].Top = 200;
Here is a sample for your reference:
AddPicture.zip
Regards,
Melba