I wouldn't normally use that filter, it's a bit aggressive, but your shot was sufficiently unsharp to try it. It might be a tad too much? - it's too early for these decisions.:kaffeetri
Cropping is an art form in itself. The 3:2 thing isn't carved in stone, but that's the format you see when you look through your viewfinder and the frame you should try to compose/work within. That's not to say you shouldn't crop to any strange shape you like if it makes a shot which doesn't work so well otherwise.
The other problem with cropping to odd shapes is you can have real problems when it comes to getting a frame to fit. Believe me - you'll curse!
The 3:2 format in this case will give you the room you need on the left in this shot anyway.
The other advantage with cropping to 3:2 is you can lie through your teeth and say that's how you saw it in the viewfinder. :naughty: