Use a combination of wide apertures, long focal lengths and close viewpoints to create a shallow depth of field. Try to compose the out-of-focus areas as well.
A selection of images of our local train. It doesn’t go anywhere, but the children love it. My preferred image is shown below, it gives just enough of the train for you to imagine what it is, and also shows the background, giving clues to the time of year and the park surroundings.

This is a technique I find very useful for botanical photographs.
My recent select from this type of images is below as I feel the background really adds to the picture:
Learning points:
- Think about the background