For me it worked like this:

            foreach (WorksheetImage shapeSource in sourceWorksheet.Shapes)
            {
                WorksheetImage shapeDestination = new WorksheetImage(shapeSource.Image);
                shapeDestination.Outline = shapeSource.Outline;
                shapeDestination.TopLeftCornerCell = GetSameCellInOtherWorksheet(shapeSource.TopLeftCornerCell, destination);
                shapeDestination.TopLeftCornerPosition = shapeSource.TopLeftCornerPosition;
                shapeDestination.BottomRightCornerCell = GetSameCellInOtherWorksheet(shapeSource.BottomRightCornerCell, destination);
                shapeDestination.BottomRightCornerPosition = shapeSource.BottomRightCornerPosition;
                shapeDestination.PositioningMode = shapeSource.PositioningMode;
                destination.Shapes.Add(shapeDestination);
            }

        static WorksheetCell GetSameCellInOtherWorksheet(WorksheetCell sourceCell, Worksheet destinationWorksheet)
        {
            return destinationWorksheet.Rows[sourceCell.RowIndex].Cells[sourceCell.ColumnIndex];
        }