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The 'miniature effect' generally comes from being above a scene looking down, and tilting the lens up to reduce the focal plane to a slice.
Generally, you would tilt up to reduce the focal plane to a slice of what's in front of you, and tilt down to extend it from your feet towards the horizon. Obviously it's more involved than that once you move the camera off the horizontal/change DoF/have a more complex scene in front of you.
This page explains things properly:
Exactly the same as if you had a normal lens with a (relatively) flat perpendicular focal plane, the more you reduce your aperture, the longer your focal plane becomes -> exactly the same on a TS lens.
So f/2.8 will give a far more pronounced effect than f/11. Use your DOF button or Liveview to see it in action.
FWIW the 45mm sounds perfect for what you want, I used to have one, but sold it to fund a 24mm.
Here's a (not particularly good) example from the 45mm that has the focal plane running horizontally across the middle of the image, so above and below will provide your OOF areas. Manipulate the angle/amount/direction of tilt to taste.
My tip is to call it 'selective focusing', then everyone gets far more comfortable than when you say 'miniature effect'
- extreme tilt won't necessarily make things look smaller anyway depending on your relationship to the subject (ie; being above etc.)