Neat Motorcycles - Atempt II :(
I think it is hard to take a really good, striking, shot of this sculpture, because of the fuzziness and clutter of the background (no matter which perspective you use). That background with building, bricks, graffiti, trash cans and window shutters will always be visible through the sculpture, no matter what you do. And it is so close, that you cannot use shallow DOF to make it less "visible".
The only real option, if you want to get a shot that makes the sculpture stand out, is to take a very large backdrop (white, grey or black, depending on lighting conditions and place it behind the sculpture in front of the wall and clutter.
That would be something you would have to cooperate on with the owners.
The sideways view of the motorcycle offers more possibilities of selection through DOF if you limit the view to that cycle.
lots of images : http://www.roelh.zenfolio.com
my E-3 user field report from Tunisian Sahara: http://www.biofos.com/ukpsg/roel.html