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No title/name is known for this work by Charlotte Molenkamp. In the vertical position, with the signature at the top left, the image leans somewhat towards a surfer. On the back there is both mounting material to hang the work both horizontally and vertically. So both compositions are depicted.
An arrow and the text 'above' have been added for vertical suspension.
That implies to me that vertical with signature at the top left is the correct hanging method.
The work is large in size.