There are certainly some interesting elements in this picture, including the rather illogically placed numerals on the ground and the three mushroom like items on the left, which probably cause you to trigger the shot anyway. However, the execution of the picture does not do these subjects much justice.
The aperture, which is definitely a bit too wide in this case, give such a small depth of field that the focus on the subject, i.e. the numerals, seems haphazard. While the numerals 5, 6 (and beyond) are probably out of the focus anyway, it is messy to see that 1 and 4 are both out of focus.
Composition is a little funny as well. Since you'd described that you were almost lying flat to take the shot, your objective seems to be capturing the numerals, and not the park. Since that is the case, leaving 3 clipped is not favourable. And including so many other non-related subjects are doing you a disfavour in distracting from the main subject. Uninteresting distractions too, since they are all out of focus.
Colours seems a little weird. I would simply just dump all the rest of the colour away and give a sepia tone. That way, the out-of-focus red objects at the back would not be any distraction at all.
Finally, the scene is not exactly straight. The pavement line at the bottom of the picture should give you a rough idea about straightness of the scene. Try to keep the poles and the mushrooms as vertical as possible too.
On an unrelated note, "A walk in the park" reminded me of the same titled 1997 song by Namie Amuro.
